Fujian Mawei Shipbuilding is building the world's first custom-made undersea mining vessel.

福建马尾造船公司正在建造世界上第一艘商用海下采矿船。

Here, highly skilled crews are kept busy repairing and building vessels of all sizes.

在这里，技术精湛的船员忙于修理和建造各种规模的船只。

That was done by building bigger and more efficient vessels, and by slow steaming, which means sailing the vessel slower so it consumes less fuel.

这是通过建造更大、更高效的船只和慢速航行来实现的，这意味着船只航行得更慢，因此消耗更少的燃料。