And it is also the professional basic course that our water resources and hydropower major must open.

同时，也是我院水利水电专业必开的专业基础课。

youdao

NAUI Advanced Open water Diver or equivalent. For this course, equivalency is proof of certification beyond entry level with experience in deep diving and underwater navigation.

NAUI进阶潜水员或相同等级的潜水员。潜水员必须提出相关证照以证明有超越基础入门之深潜与水中导航的实际经验。

youdao

In 2009 an estimated 20, 000 spectators watched 6, 000 swimmers brave the one-mile, open-water course.

BBC: Cumbria Great North Swim cancelled over safety fears