oxygen

Humans take in oxygen and breathe out carbon dioxide .

人吸入氧气，呼出二氧化碳。

All life depends ultimately on oxygen .

一切生命归根到底都要依赖氧气。

Hydrogen and oxygen combine to form water .

氢与氧化合成水。

A lack of oxygen may inhibit brain development in the unborn child .

缺氧可能阻碍胎儿的大脑发育。

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。

Oxygen has high reactivity .

氧的反应性很高。

Plants absorb oxygen .

植物吸收氧气。

Ozone is a highly reactive form of oxygen gas .

臭氧是一种非常活跃的氧气形态。

Blood is the medium in which oxygen is carried to all parts of the body

血液是将氧气输送到人体各个部位的媒介。

Smoking and drinking interfere with your body 's ability to process oxygen .

抽烟与酗酒有碍身体处理氧气的能力。

The brain requires a constant supply of oxygen

大脑需要持续供氧。

Plants and trees filter carbon dioxide out of the air and produce oxygen .

花草树木会过滤掉空气中的二氧化碳并制造氧气。

All the cells and tissues in the body benefit from the increased intake of oxygen .

体内所有的细胞与组织都从增加的氧气吸入量中受益。

The human brain needs to be without oxygen for only four minutes before permanent damage occurs .

人的大脑缺氧4分钟后便会造成永久性损伤。

He had the presence of mind to put his emergency oxygen tube in his mouth .

他镇定自若地把应急输氧管放进了自己的嘴里。

Carbon , hydrogen and oxygen combine chemically to form carbohydrates and fats

碳、氢、氧化合形成碳水化合物和脂肪。

If headaches only occur at night , lack of fresh air and oxygen is often the cause

如果只是在晚上头疼，那常常是由于缺乏新鲜空气和氧气的缘故。

The drug increases the number of red cells in the blood , enhancing oxygen uptake by 10 percent .

这种药增加了血液里的红细胞数量，从而将摄氧量提高了10%。

Supplementary oxygen is rarely needed in pressurized aircraft

密封的飞机内很少需要补充氧气。

If all the coronary arteries are free of significant obstructions , all parts of the heart will receive equal amounts of oxygen .

如果所有的冠状动脉均没有较大的阻塞物，心脏各部分将得到等量的氧气。

It is 2,300 metres above sea level , so a given volume of air contains only about one-third as much oxygen as it would at sea level

这是在海拔2,300米的高空，因此一定体积空气的含氧量只有海平面处的约1/3。

Atoms of iron in the nail combine with atoms of oxygen from the air to form molecules of iron oxide , or rust .

钉子里的铁原子与空气中的氧原子结合后形成氧化铁分子，也就是锈。

Iron oxide is a compound of iron and oxygen .

氧化铁是铁和氧的化合物。

Water is composed of hydrogen and oxygen .

水由氢气和氧气组成。

There is little oxygen at high altitudes .

在海拔高的地方氧气很少。

He is only 9 years old , but he knows that hydrogen and oxygen combine to form water .

他只有9岁，却知道氢与氧化合成水。

A molecule of water is formed by combining two atoms of hydrogen and one atom of oxygen .

水分子是由两个氢原子和一个氧原子构成的。

Water is a compound containing the elements hydrogen and oxygen .

水是含有氢元素和氧元素的化合物。

Water can be resolved [ decomposed ] into hydrogen and oxygen .

水可分解为氢和氧。