scuba

You must complete a certification course before you can go scuba diving in the open ocean.

(Chinese) 你必须先完成认证课程，然后才能去公海进行水肺潜水。

The divers checked their scuba tanks and masks before jumping off the boat into the coral reef.

(Chinese) 潜水员在从船上跳入珊瑚礁之前，检查了他们的水肺气瓶和面罩。