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And it mainly includes the action of 1,3-diethylene alkylation and acidyl; the action of addition of carbonyl compound; the action of chlorortrimethys:lane and the reaction of diethy lene.

对含硫碳负离子─—1，3-二噻烷合成方法有机合成上用进行比较系绍，主要绍1，3-二噻烷烃基化和酰基化反，与羰基化合物加成反，与氯化三甲硅反1，3-二噻烷还原反。

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原声例句
剑桥雅思真试题 9

This is dealt with organically - it's purified by being filtered through reed beds which have been planted for that purpose in the garden.

这是有机化处理，它过芦苇地被净化了，这就是里种它们的用途。

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lowness, low-numbered, low-paid, lowpass, low-pitched, low-porosity, low-power, low-powered, low-pressure, low-producing,

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3G, 401(K), a,
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