Underswing
负脉冲(信号)(瞬态特性), 负尖峰(信号)
🗣️ 情景例句
Hello.
喂。
What's your friend doing?
你的朋友正在做什么？
When it grew dark, she turned a suitcase into a bed and put the children inside it, covering them with all the clothes she could find.
天黑下来的时候，她把提箱当作小床，把两个孩子放了进去，又把所有能找到的衣服都盖在了孩子们身上。