turn on: 打开(电器之类的)
例如:Turn on the radio,please.
turn over: 翻转
例外:If you turn the box over, you'll see some words at the bottom of it.
turn down: 关小(电器之类的)声音
例如:Turn down the TV,please.Dad is sleeping now.
turn to:向某人求助
例如:He turn to his best friend for help.
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