A very large ship, usually between 100,000 and 400,000 displacement tons, used for transporting oil and other liquids in large quantities.

通常排水量在100,000和400,000吨之间的，用于运输大量石油和其它液体的十分巨大的船只。

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Instead of saying the ship's weight is so many thousand tons, we say its displacement is that many tons.

我们不说船的重量为多少千吨，而说船的排水量是多少吨位。

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