我把面粉装在金属罐里以防受潮。

I store the flour in a metal ___canister to keep it dry.

士兵们投掷了催泪瓦斯罐来驱散人群。

The soldiers threw ___canisters of tear gas to disperse the crowd.

吸尘器的集尘盒满了，需要清理一下。

The ___canister of the vacuum cleaner is full and needs to be emptied.