Underswing
负脉冲(信号)(瞬态特性), 负尖峰(信号)
🗣️ 情景例句
We used to catch crabs.
我们以前常捉螃蟹。
Are you free tomorrow?
你明天有空吗？
The old lady was glad to be back at the block of flats where she lived.
老妇人回到了她居住的公寓楼，心里很高兴。