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重点讲解：
1. in between 在…之间，介于…之间；
Berlin was well known for its good living in between the two world wars.
在两次世界大战之间，柏林生活的优裕是众所周知的。
2. at the same time 同时；
Roll the wine around in your mouth, drawing in air at the same time.
让酒在嘴里滚一下，同时吸气。
3. add to 添加；增加；掺加；
Add some water to the tea; it's too strong for me.
茶太浓了，给我对点儿水。
4. for sure 无疑；肯定；
We cannot say for sure what will happen.
我们无法确定会发生什么事。
adj. 基本的，根本的，重要的
n. 基本原
