1.打開He sat down at the wheel of his car and turned on the ignition. 他坐在汽車駕駛盤前, 發動了引擎。Shall I turn on the bath for you? 我給你放浴水好嗎?
2.取決於...The question turns on what approach you take. 問題取決於你採用什麼方法。The normalization of the relations between the two countries turns on this point. 兩國關係的正常化取決於這一點。
3.(使)高興或興奮The boy turned on at the sight of the fall. 孩子一看到大瀑布便激動起來。