動(dòng)詞 come about:

1. come to pass
   同義詞：happen, hap, go on, pass off, occur, pass, fall out, take place

1. How did it come about that he knew where we were?
   他是怎么知道我們?cè)谑颤N地方的呢？
2. Expected or required but not yet having come about.
   期待發(fā)生的被期望或要求但仍未發(fā)生的
3. Layoffs designed to effect savings. Thus the sentence These measures may affect savings could imply that the measures may reduce savings that have already been realized, whereas These measures may effect savings implies that the measures will cause new savings to come about.
   旨在完成存款的歇業(yè)。因而句子這些措施可能影響存款暗含這些措施可能減少本以已實(shí)現(xiàn)的存款，而這些措施可能完成存款則暗含這些措施將導(dǎo)致新的存款的產(chǎn)生
4. How did this come about?
   這是怎么發(fā)生的?