Unique variable
[计] 唯一变量
🧩 词语组成解析
🗣️ 情景例句
I must meet the deadline.
我必须赶上最后期限。
After the flood, the carpets were wet for a month.
洪水过后一个月，毛毡还是湿的。
It is better to ask for help at the beginning rather than to wait until a busy period when everyone is rushed off their feet.
最好在开始工作时就请人帮忙，而不是等到大学都忙得不可开交的时候。