音标：[ˈsʌbstənsiz] ；

n. 物质( substance的复数形式 ); 实质; 物体; [哲学]1)。本质

n. the real physical matter of which a person or thing consists
n. the choicest or most essential or most vital part of some idea or experience
n. the idea that is intended

历年考研英语阅读理解mp3(97-3)

[00:00.00]在线英语听力室( www.tingroom.com )友情制作 [00:03.69]1997 Passage3 [00:07.32]Technically, any substance other than food [00:10.48]that alters our bodily or mental functioning is a drug. [00:15.31]Many people mistakenly believe the term dru

发表于:2018-12-01 / 阅读(367) / 评论(0)

历年考研英语阅读理解

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[00:04.02]Language Function: Asking about Like and Dislikes in Sports [00:10.81]A:Did you attend the sports meeting last Sunday? [00:16.01]B:Certainly!I love sports. [00:19.80]A:What's your favourite sport? [00:22.78]B:Pingpong! A:Pingpong?Why? [00:2

发表于:2018-12-04 / 阅读(518) / 评论(0)

高中英语上外版二年级

VOA标准英语2017--Unified Effort Needed Against Synthetic Drugs

Illicitly used Synthetic drugs are chemically produced psychoactive substances that mimic the effects of illegal narcotics, which have been altered just enough to avoid classification as illegal. And this is one reason why these chemicals are dangero

发表于:2018-12-08 / 阅读(440) / 评论(0)

VOA标准英语2017年(三月)

VOA慢速英语2011--Sports Doping: From the Laboratory to th

SCIENCE IN THE NEWS - Sports Doping: From the Laboratory to the Playing Field FAITH LAPIDUS: This is SCIENCE IN THE NEWS in VOA Special English. Im Faith Lapidus. BOB DOUGHTY: And I'm Bob Doughty. Today, we tell about sports doping the use of drugs o

发表于:2018-12-16 / 阅读(289) / 评论(0)

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Unit 6 DIALOGUE I Work Ethics A: Do you think a telephone operator should be concerned about the worries of callers? B: Well, it's not her job. At least I wouldn't interfere in other people's business

发表于:2018-12-29 / 阅读(384) / 评论(0)

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That arn computer well is important.

本讲为2006年下半年新的教学内容，请对照讲义听声音！ Students(researcher/scholar) of Nature are not satisfied with guessing, but they observe, day after day, the changes which tak

发表于:2018-12-30 / 阅读(341) / 评论(0)

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VOA慢速英语20060829b

SCIENCE IN THE NEWS - From the Laboratory to the Playing Field: World of Sports DopingBy George Grow, Nancy Steinbach and Caty Weaver Broadcast: Tuesday, August 29, 2006 VOICE ONE: This is SCIENCE IN

发表于:2019-01-02 / 阅读(319) / 评论(0)

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On Mars, NASA Finds ‘Organic’ Substances Linked to Life

The United States space agency says its Mars exploration vehicle has discovered chemical substances necessary for life. Scientists reported that NASAs Curiosity rover found large amounts of organic molecules in 3.5 billion-year-old rock in an area ca

发表于:2019-01-03 / 阅读(313) / 评论(0)

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英语分类词汇：环境污染

污染物 aerosols气溶胶 / 气雾剂 agricultural wastes农业废物 asbestos石棉 commercial noise商业噪音 composite pollution混合污染 dioxins二恶英 hazardous substances危险物质 hazardous wastes危险废物 heavy metals重金属 h

发表于:2019-01-03 / 阅读(372) / 评论(0)

英文语法词汇

与美国小学生一起学英文第12册第9期:酸

Acid 酸 Why does the lemon taste sour? 为什么柠檬的味道很酸？ It is because of the acid in a lemon. 因为柠檬里有酸。 Then what is acid? 那么什么是酸？ All substances with a sour taste are kinds of acid. 所有带酸味的物质

发表于:2019-01-10 / 阅读(322) / 评论(0)

与美国小学生一起学英文第12册

VOA慢速英语2014 地球臭氧层出现恢复迹象

Earth's Ozone Layer Shows Signs of Recovery 地球臭氧层出现恢复迹象 The new report says the Earths ozone layer is showing signs of recovery. Ozone is a form of oxygen. It is found in the air we breathe and in Earth's atmosphere. The ozone l

发表于:2019-01-12 / 阅读(402) / 评论(0)

2014年VOA慢速英语(九)月

英国学生科学读本第64期:红色金属--铜(1)

Lesson 64 The Red Metal Called Copper 第64课红色金属铜 There is only one metal which is red in colour. Its name is copper. On the shores of Lake Superior in North America, lumps of pure copper are found in the rocks; but in Cornwall , and in

发表于:2019-01-17 / 阅读(350) / 评论(0)

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托福语法：most的其他用法

对于most来讲，除了构成某些词最高级外，most的用法有几点需要注意，经常成为改错题的考点： 1．当most表示大多数时，之前不加the, 并且有两种形式来表示大多数，分别为： most + 名词，如：

发表于:2019-01-17 / 阅读(263) / 评论(0)

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read by Frank McCourt. THERE was no hope for him this time: it was the third stroke. Night after night I had passed the house (it was vacation time) and studied the lighted square of window: and night after night I had found it lighted in the same wa

发表于:2019-01-24 / 阅读(342) / 评论(0)

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Although chemistry had come a long way in the century that separated Newton and Boyle from Scheele and Priestley and Henry Cavendish, it still had a long way to go. Right up to the closing years of the eighteenth century (and in Priestley's case a li

发表于:2019-01-29 / 阅读(315) / 评论(0)

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81 一年轻妇女死于药品试验 DATE=8-11-01 TITLE=IN THE NEWS #493 - Testing of Drugs BYLINE=Nancy Steinbach （Start at 1'05

发表于:2019-01-30 / 阅读(416) / 评论(0)

科技之光

联合国:臭氧层将于2048年恢复原状

Ozone layer（臭氧层） 'is no longer disappearing and will return to full strength by 2048', says UN report. The ozone layer is no longer disappearing and could be back to full strength by the middle of this century, UN scientists have confirmed（

发表于:2019-02-07 / 阅读(267) / 评论(0)

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11.Acids are chemical compounds that,in water solution,have a sharp taste， a corrosive action on metals,and the ability to turn certain blue vegetable dyes red. 12.Billie Holiday's reputation as a great jazz-blues singer rests on her ability to giv

发表于:2019-02-13 / 阅读(307) / 评论(0)

托福英语

Western Australia bans new synthetic cannabis

SYDNEY, Aug. 5 (Xinhua) -- The Western Australian Government announced on Friday that 14 new substances linked to the manufacture of the synthetic drug Kronic would be banned from Friday midnight. The State Mental Health Minister Helen Morton told th

发表于:2019-02-19 / 阅读(350) / 评论(0)

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Voice 1 Welcome to Spotlight. I'm Bruce Gulland. Voice 2 And I'm Marina Santee. Spotlight uses a special English method of broadcasting. It is easier for people to understand - no matter where in the world they live. Voice 1 A group of businessmen en

发表于:2019-02-21 / 阅读(358) / 评论(0)

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学英语单词

'he

-some

acrylic monomer-induced dermatitis

afterss

air conditioning base temperature