潜水员应该都随身携带一个能在水下发出清晰可听见的大声音的东西。

Divers should carry an easily activated noise maker that's clearly heard underwater.

youdao

潜水员应该都随身携带一个能在水下发出清晰可听见的大声音的东西。

Divers should carry an easily activated noise maker that's clearly heard underwater.

youdao