Pfm
abbr. power factor meter 功率因数计
🗣️ 情景例句
When you learn a new verb, learn its various forms.
学到了新动词时，记住它的各种形式。
He is suffering the humiliation of failure.
他正在蒙受失败的屈辱。
This is because the surface of the earth is not flat but round.
因为地球表面不是平的，而是圆的。