Watch to time air supply in aqualung.

用手表来计算氧气瓶中气体的供应量。

The President of Russia Dmitry Medvedev dived with aqualung to the bottom of the Volga and thought about ecology during…

在与俄罗斯总理弗拉基米尔·普京一同休息期间，总统梅德韦杰夫潜水入到伏尔加河底，他思考环境问题。

It was a perfection of a valve that made the aqualung possible and put man back into the sea with all the freedom of a fish.

是阀的完善使研究水中呼吸器成为可能，并将人类送到海里，使其象鱼一样自由。