这些照片是证明他当时在场的有力证据。

These photos serve as strong ___proof that he was present at the time.

设计师仔细检查了印刷样张，确保没有错误。

The designer carefully checked the ___proof to ensure there were no mistakes.

这瓶伏特加是80度的，比大多数烈酒都要烈。

This bottle of vodka is 80 ___proof, stronger than most liquors.

这款手表是防水的，可以在游泳时佩戴。

This watch is ___waterproof and can be worn while swimming.