如果你知道如何弹钢琴，别人会出钱请你教他们。
If you know how to play the piano, this is a skill other people will pay you to teach them.
youdao
他已经忘却如何弹钢琴。
He has forgotten how to play on the piano.
应用推荐
模块上移
模块下移
不移动