音标：[ˈpɔzitivz] ；

n. 确实( positive的复数形式 ); 正片; <语>原级形容词; 明确性

n. the primary form of an adjective or adverb; denotes a quality without qualification, comparison, or relation to increase or diminution
n. a film showing a photographic image whose tones correspond to those of the original subject

60秒科学:利用录音发现青蛙的数量可能被高估了

Frog census volunteers misinterpreted recorded frog sounds in the field, leading researchers to suspect that frog populations may be even lower than thought. Declining frog populations are considered an indicator of environmental damage. But new rese

发表于:2019-01-02 / 阅读(198) / 评论(0)

60秒科学

SSS 2010-08-05

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute Declining frog populations are considered an indicator of environmental damage. But new research finds that frogs might be doing even worse than we thou

发表于:2019-01-08 / 阅读(154) / 评论(0)

Scientific American(八)月

流行美语 (Popular American) 328

Larry和李华一起坐地铁回家。今天我们要学两个常用语：get the ball rolling和mull it over. LH: Larry, 这两天天气真好，我看，过不了多久树就要发芽了。我真巴不得春天马上就到。 LL: Me too. I can't wa

发表于:2019-01-15 / 阅读(155) / 评论(0)

美国之音《流行美语》

英语语法：34 Appositives

Grammar Girl here. Todays topic is appositives. Guest-writer Bonnie Trenga writes, Today we have to decide if information is essential or extra, because if its extra well need some extra commas. The concept Im referring to is called an appositive. A

发表于:2019-01-30 / 阅读(242) / 评论(0)

英语语法 Grammar Girl

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