她开始用钢琴演奏那首民歌.She struck up a folk melody on the piano.应观众再唱一曲的要求, 他清唱了一首民歌.For an encore, he sang an unaccompanied folk song.她在哼一首我以前从未听过的民歌.She is humming a folk song that I never heard before....
They had been up all night and were sleeping it off.他们前一天整夜未眠，所以这时正在补觉。They are sleeping in the carpenter's shop directly above.他们正在正上方的木匠铺子里睡觉。It is never a good idea to take sleeping tablets regularly.频繁服用安眠药绝对不是好...