Underswing
负脉冲(信号)(瞬态特性), 负尖峰(信号)
🗣️ 情景例句
Well,
好了，
I cannot hear the tape.
这卷录音带什么都听不到。
Old women in black shawls peered at us from doorways.
披黑纱巾的老妇人站在门口偷偷地瞅着我们。