lightship

n.

（停泊在危险水域作导航用的）灯塔船；

复数：lightships

1. It is a vitally important task to achieve control of the weight and center of gravity of lightship during building a new ship.
   灯塔船在其建造的过程之中,其重量与重心的控制是一门非常重要的学问。

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