Serrasoid
锯齿波(调制)
🗣️ 情景例句
The Post Office aims to improve its quality of service.
邮局锐意改善服务质量。
What do you think?Is that right?
你认为什么?那是正确的？
My sister is only seven, but she always tells me whether my pictures are good or not.
我的妹妹只有7岁，但她总能说出我的画是好还是坏。