For diving there's small sealed tank inside, the negative tank.
为了下潜，里边还有个密封小水槽—负槽。
Cement and concrete shall be transported in hermetically sealed tank car.
水泥和混凝土运输应采用密封罐车。
Based on these, protective measures and proposals of revamp for water-sealed tank are put forwards.
针对故障的原因提出了防范措施，并结合实际情况对水封罐的改造提出了建议。
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