菲尔信心十足地走向前去,本却踌躇不定.Phil walked forward confidently but something held Ben back.踌躇了半天, 他终于直说了.After a long hesitation, he told the truth at last.他踌躇了一会儿.He paused for a moment....
在较高的烯烃情况下, 高能的中间物稳定作用更易出现.With the higher olefins, stabilization of the energetic intermediates occurs more easily.我们实际上遇到介乎此两个极端的中间物.We would actually encounter a mean between these extremes.这样可以得到最高产率的反应中间物,即目的产物.This ...