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(80) / 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(214) / 评论(0)

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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(131) / 评论(0)

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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

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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

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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(85) / 评论(0)

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

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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(73) / 评论(0)

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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

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发表于:2019-01-17 / 阅读(61) / 评论(0)

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发表于:2019-01-17 / 阅读(43) / 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(48) / 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(60) / 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(84) / 评论(0)

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发表于:2019-02-07 / 阅读(53) / 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(60) / 评论(0)

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发表于:2019-02-19 / 阅读(86) / 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

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anhydrous sodium sulfate

cellular sheet pile wharf