This piano wants keying up.

这架钢琴需要调音。

Provides Tone Keying and Repeat Mode.

提供单音键控和重复模式。

This is called "amplitude shift keying".

这就是所谓的“振幅键控”。

TFM belongs to Correlative Phase Shift Keying.

TFM是一种相关相移键控信号。

I remember when I was keying in the last paragraph.

记得我做电脑输入最后一段时的情形。