With the increase of the tonnage and power of ocean-going ship, more and more attentions are paid to the match among vessel, main engine and propeller by shipping and shipbuilding world.

随着海洋运输船舶的吨位和功率不断增长，船舶推进系统中船机桨配合研究越来越受到世界造船业和航运业的重视，成为船舶科技领域的重要课题之一。

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At present, with the increasing tonnage of ship and more and more ships propelled by electric power, the capacity of a generator in a Marine power station is getting larger and larger.

目前，由于船舶吨位的不断增加以及柴油机—电力推进船舶的不断涌现，使船舶电站发电机的容量越来越大。

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The relation of tonnage to grade in the deposit is subject to exponential function, rather than power function.

矿床的吨品位关系对幂律分布并不能很好地拟合，而是服从指数分布。

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