提及性治疗，大多数人会尴尬地偷笑。Mention sex therapy and most people will titter in embarrassment.他忍不住偷笑了一声。He can't help a suppressed giggle.哥嫂俩相视偷笑.The Lius then exchanged glances and smiled surreptitiously....

“偷笑”的英语可以翻译为：laugh in one's beard，titter ...