turnonn.接通开启turnv.翻转；旋转；转动；转向；轮流；（使）变得n.轮流；转动turn the sheet back把被单翻开turn our nose up atvt.对 ... 之以鼻(瞧不起)turn someone's headturn about the axis绕轴旋转turn of the centuryn.19世纪未20世纪初；19世纪与20世纪转换交替时期turn one's toes outTurn to page ten.翻到第十页。turn his nose up atvt.对 ... 之以鼻(瞧不起)turn on the current接通电流turn back the clockvi.把钟拔回(使时光倒退)

1. His face turned gray as he heard the bad news.
   听到这个坏消息后，他的脸变得苍白。
2. He is turning gray.
   他变灰白了。