40年代前，船海不是靠蒸汽推动，都是由人力拖到上游。有的船重达120吨。
Until the 1940s, when boats were powered by their own steam, vessels weighing as long as 120 tons were pulled upriver by human muscle.
这款机动游艇，顾名思义，长58米，宽38米，总计为宾客提供3400平方米的面积，船重2400吨。
The motor yacht is, as the name suggests, 58 metres long and 38 metres wide, providing a total guest surface area of 3, 400sq metres, and weighs in at 2, 400 tonnes.
如果钢比水重，为什么船能在海上漂浮？
If steel is heavier than water, why are ships able to float on the sea?
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