canister

a canister respirator

防毒面具

riot police fired tear-gas canisters into the crowd.

防暴警察向人群发射催泪弹。

The cooling system consists of two reusable sealed water filled canisters that are easily refrozen in one step without the need for multiple freezing steps.

冷却系统中含有以重复使用密封冷却体，易于冷冻，一步骤即完成，不需要复杂冷冻程序。