Underswing
负脉冲(信号)(瞬态特性), 负尖峰(信号)
🗣️ 情景例句
for reading to the kids in the hospital.
为住院的孩子朗读。
My watch is more expensive because it's a chronometer.
我的手表是精密型的，所以要比你的贵。
None of us is afraid of difficulties.
我们当中没有一个人害怕困难。