And yet nobody prolonged his underwater work beyond the time allotted him.

可是，没有谁超出指定的时间，延长自己在水下的工作。

For underwater work projects, the workman wears a waterproof suit with his head imprisoned in a metal capsule, while he receives air from above by means of force pumps and flow regulators.

工人在水底下工作时，穿上～件不透水的衣服，头上套了一个金属的盒子，再利用打气机和节流器，就可以从水上面获得空气。