Sign function
[计] 符号函数
🧩 词语组成解析
🗣️ 情景例句
Do you know that I mean?
知道我的意思吗？
This stain is really stubborn.
这污垢去不掉。
He did very badly on the exam----worse than expected almost the worst in the class.
他考的不好，比期望的还糟。几乎是全班最差的。