turn短语，turn on打开电器、水龙头这些，Turn on the light， it's dark here. turn off关掉它们，Remember to turn off the gas after cooking. turn up调高音量Turn up the radio， I like this song. 人出现也可以用，He finally turned up at the party. turn down调低音量Turn down the TV， it's too noisy. 拒绝别人的邀请、提议也用它，She turned down his invitation.
