but then (again)

after all; on the other hand (introducing a contrasting comment)

另一方面，然而

it couldn't help, but then again, it probably couldn't hurt.

它沒什么用，不過可能也沒危害。

then and there

immediately

當(dāng)場，立即

and then some【非正式用語】

With considerably more in addition

而且遠(yuǎn)不止此

This project will take all our skill and then some.

這個工程將采用我們所有的技術(shù)，而且遠(yuǎn)不止此