世界各地的古人们用不同的方法杀死水里的细菌。
Ancient people around the world used different ways to kill the bacteria in the water.
世界做大也是唯一商业目的的波电站看上去就像一条500英尺（150米）长，11英尺（3.5米）宽，在海面漂浮着，一半浸没在海水里的蛇。
The world's first and only commercial wave power plant resembles a 500-foot- (150 meter-) long, 11 foot- (3.5 meter-) wide snake that floats, half-submerged, on the sea surface.
跳进水里，在我能够游回生的世界之前，肺中的空气无助于我。
Jumping into the water, the air in my lungs would fail me before I could swim back to the living world.
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