Serrasoid
锯齿波(调制)
🗣️ 情景例句
Thanks, Susan.
谢谢， Susan。
Offence is the best defence.
进攻是最好的防御。
I've been working so hard recently that I haven't had any time for collecting new stamps.
最近我的学习一直很紧张，没有时间收集新邮票。