He gave us his solemn word, then he welshed on us.他向我们郑重承诺然后又对我们食言了。She welshed on ( the bargain she made with ) us.她与我们洽谈成交后又翻悔了.He often welshed on his promises.他过去经常逃避义务,不履行诺言....
水煮沸5分钟便可得到净化。Water can be purified by boiling for five minutes.她围绕这个主题添枝加叶地说了大约10分钟。She embroidered on this theme for about ten minutes.他们在车里又坐了10分钟,边说边搂着亲热。They sat talking and necking in the car for another ten minutes...