Betti number
[计] 贝蒂数
🧩 词语组成解析
[计] 贝蒂
🗣️ 情景例句
OK, sir, just sit tight, and we'll have an ambulance there in about ten minutes.
好的，先生。你就在那边等着，救护车10分钟之内到。
A lazy youth,a lousy age.
少时懒惰老来苦。
But you still haven't explained what you're doing here.
啊，你还没有说你是来干什么的。