It wasn't until he started laughing that they cottoned on!他开始笑起来，他们才明白是怎么回事。She had already cottoned on to the fact that the nanny was not all she appeared.她已经意识到这个保姆不只是她看起来的那样。It was evidently from ulterior motives...

cottoned的音标：...

vi.喜欢（cotton的过去式与过去分词形式）...