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1. touchstone n. 试金石；（检验）标准 SYN: standard/criteria
2. for sake 为了…的缘故
eg. Just for sake of argument, we'll assume it's about there, and I do the same thing.
为了方便起见,我们假定就在这里，重复之前做的。
3. be proud of 为…骄傲
eg. We all have much to be proud of.
我们都有很多值得自豪的东西。
