法医在犯罪现场发现了一个清晰的牙印，这可能成为破案的关键证据。

The forensic team found a clear ___bite mark at the crime scene, which could be crucial evidence for solving the case.

苹果上的牙印表明有人已经咬了一口。

The ___bite mark on the apple showed someone had taken a bite.