释义：

turn on 打开，使某人产生兴趣，使兴奋

turn down (up) 为控制音量的大小，而 turn on (off) 是打开或关闭电源。因此也可以进一步表示让他人产生某种兴趣。

例句：

Do you want me to turn off the TV?
你想要我关电视吗？
Turn off the lights before you come to bed.
在上床之前记得关灯。
You have to turn the gas valve off before going out.
你出门前必须要把煤气阀门关上。
To be honest with you, I got very turned on by you.
老实说，你让我非常兴奋。

对话：

A: Who forgot to turn on the alarm?
是谁忘了关掉闹钟？
B: It's my fault.
是我的错。