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With a strong poison spray aimed at a bunch of flying insects, it's easy to imagine several of them falling together at the same time. Because flies are small and dirty creatures, we do not much care if many die at once. However, when it comes to hum

发表于:2018-12-07 / 阅读(79) / 评论(0)

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Now, back to the mole. Not that mole. 现在，回到摩尔，不是鼹鼠。 This mole. Yep, this number has a second name.The mole. 这个摩尔，没错，这个常数有另一个名字,摩尔. Chemists use the term mole to refer to the quantities

发表于:2018-12-18 / 阅读(37) / 评论(0)

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Key Sentences（重点句子） 494．We want to order a large number of paintings. 我们要订购一大批画。 495． Is there a discount for buying in large quantity? 大批订购有没有折扣优惠？ 496．We are running a special offer now．

发表于:2019-02-18 / 阅读(29) / 评论(0)

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Bacillus coprogenes parvus