1.but rather 而是
On the streets of Seoul, there was no sense of panic, but rather an undercurrent of anxiety.
在汉城的街道，没有恐慌感，而是一种焦虑的暗流0OT2#a!s%fznv89]。

2.it's fair to say that 说句公道话；公平地说
It is fair to saythat a considerable amount of effort has gone into the project.
说句公道话，这一计划是花费了很大的心血的Z#9RG8-!k&Q(&j。

3.a set of 一套；一组
The goal is not to have a set of precise numbers, but a set of reasonable estimates for an Earth-restoration budget.
这样做的目的并不是为了获得一套准确的数字，而是为修复地球的花费作出一套合理的估算A+.k4~M(|3bsakjL.3TR。

4.bet on 打赌
He said he would be delighted if the United States managed to stave off a recession, but added he would not bet on such an outcome.
他说，如果美国能设法度过衰退，他将非常高兴!Lr2x,)ki*Ub*-fN。但是他说，他不会打赌一定会是这样的结果4KJe_Tzckyf-7YV。