His jokes were somewhat farfetched.

他的笑话有些牵强附会。

The analogy is rather farfetched.

这个比方有点驴唇不对马嘴。

Your explanation sounds farfetched.

你的解释有些牵强。

A farfetched prediction?

一个牵强的预测吗？

Well, it may not be so farfetched.

那么，它可能不那么牵强。