Fish take in oxygen through their gills.
鱼用鳃吸取氧气。
Hydrogen and oxygen combine to form water.
氢与氧化合成水。
Hydrogen combines with oxygen to form water.
氢与氧化合成水。
Humans take in oxygen and breathe out carbon dioxide.
人吸入氧气，呼出二氧化碳。
A molecule of water consists of two atoms of hydrogen and one atom of oxygen.
水分子由两个氢原子和一个氧原子构成。
Two atoms of hydrogen combine with one atom of oxygen to form a molecule of water.
两个氢原子和一个氧原子结合组成一个水分子。
Water contains hydrogen and oxygen.
水含有氢和氧。
The higher one climbs, the less oxygen there is in the air.
爬得越高，空气中的氧气就越少。
Trees help keep the air clean and they make oxygen that we can breathe.
树木有助于净化空气，释放出可供我们呼吸的氧气。
To do CPR, you press on the sick person's chest so that blood moves through the body and takes oxygen to organs.
做心肺复苏时，你要按压病人的胸部，使血液在体内流通，将氧气输送到各个器官。
The adult tree gives us shade, oxygen and natural beauty.
大树为我们提供荫蔽、制造氧气，让我们享受大自然的美丽。
In fact, the Amazon Rainforest is the "lungs of our planet" because it produces 20% of the world's oxygen.
事实上，亚马逊雨林是“地球之肺”，因为它为地球供给了20%的氧气。
Rainforests are the lungs of the planet storing vast quantities of carbon dioxide and producing a significant amount of the world's oxygen.
雨林是地球之肺，储存了大量的二氧化碳，并为世界生产了大量的氧气。
Security for us is like oxygen.
对于我们来说，安全就像氧气一样。
People and animals need oxygen to live.
人类和动物需要依靠氧气生存。
Borrowers then learn that credit is like oxygen.
借款者这才认识到，信用就像氧气。
But it still has this incredible ability to release oxygen.
但它仍然拥有令人不可思议的释放氧气的能力。
They are like the hydrogen and oxygen of the world of mathematics.
他们就像是数学世界的氢和氧一样。
Iron also carries oxygen in muscles, helping them function properly.
铁同样可以将氧气带至肌肉帮助其正常工作。
These plants will produce the food, water and oxygen that we need.
这些植物将会产出我们所需要的食物、水和氧气。
Then take three deep inhalations, filling your cells with vital oxygen.
然后再深呼吸三次，让细胞充满氧气。
The wetland plays a crucial role in producing oxygen and purifying the air.
湿地在产生氧气和净化空气方面有至关重要的作用。
Trees take in carbon dioxide from the air and make oxygen. That's important.
树木可以吸收二氧化碳，并释放氧气，这非常重要。
Get the blood flowing and the carbon dioxide out and bring in healthy new oxygen.
让血液流动起来，让二氧化碳呼出去，换进新鲜健康的氧气。
The planet has a relatively thin atmosphere composed mostly of nitrogen and oxygen.
这颗行星有相对较薄的大气层，主要由氮气和氧气组成。
Some, like hemoglobin, deliver oxygen from the lungs to the far reaches of the body.
有些蛋白质像血红蛋白一样，可以把氧从肺部输送到身体各处。
Hydrogen fuel cells work by combining hydrogen and oxygen to produce electricity.
氢燃料电池通过氢氧结合产生电能。
Photosynthesis by phytoplankton removes carbon dioxide from the air and produces oxygen.
浮游植物通过光合作用消耗空气中的二氧化碳产生氧气。
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