Shark is the only fish in the sea that has no pneumatocyst, which means that it will swim to the bottom or even die if stopping swimming for a little while.
没有气囊的鱼，只要停止游泳一小会儿，它就会沉下去甚至会死掉。
And Marley does more than just doggy paddle, this golden retriever loves to dive and swim right to the bottom of this seven-foot pool.
马莉会的可不只是狗刨式游泳，这只金色的寻回犬还喜欢潜水，可以直游到这个深七英尺深水池的底部。
This will help you learn to swim straight without using the bottom of the pool as a guide.
这将有助于你学会游直线而不借助池底的导航线。
It has large openings at the bottom of the net. Because when haddock face a net, they swim up to escape and get caught.
网底部设计成大开口，因为黑线鳕撞到渔网第一反应是向上游动以逃生；
Here's the bottom line: you can't learn to swim sitting at the kitchen table.
这里的底线：你不能学习游泳，坐在厨房桌旁。
Here's the bottom line: you can't learn to swim sitting at the kitchen table.
这里的底线：你不能学习游泳，坐在厨房桌旁。
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