21.Then again

用法：Use this to cast doubt on an assertion.

这个短语用来针对一个论断抛出疑问。

E.g.: Writer A asserts that this was the reason for what happened. Then again, it’s possible that he was being paid to say this.

22.That said

用法：同“then again”.用法相同。

E.g.: The evidence ostensibly appears to point to this conclusion. That said, much of the evidence is unreliable at best.

23 .Yet

用法：用来介绍一个相反的观点。

E.g.: Much of scholarship has focused on this evidence. Yet not everyone agrees that this is the most important aspect of the situation.

附带说明：

有时候，你需要指出一个论据的不足或者提出附带条件，下面这些表达可以帮助你。

24.Despite this

用法：“despite this” 和 “in spite of this用来表达尽管论据上存在不足，但你会列出一个站得住脚的观点来支持。

E.g.: The sample size was small, but the results were important despite this.

25.With this in mind

用法：当你想让读者在了解了某个事物的相关知识后，思考某一个观点时。

E.g.: We’ve seen that the methods used in the 19th century study did not always live up to the rigorous standards expected in scientific research today, which makes it difficult to draw definite conclusions. With this in mind, let’s look at a more recent study to see how the results compare.”