The general term would be an " artificial limb" (limb).

通用术语将是“人工肢体” （limb）。

" No, you wouldn't. I spotted his artificial limb. But proceed" .

“不，你不会。我发现了他的假肢。但是继续” 。

But apparently, it's super painful to work under water when you've got an artificial limb, and I'm guessing it was pretty traumatic to go back and work in the field where he got blown up.

但显然，当你有一个假肢时， 在水下工作是非常痛苦的，我猜回去在他被炸毁的田野里工作是非常痛苦的。