这一句英文是什么意思：oxygen from the water mixes with oxygen from the

As is known,the oxygen we breathe in mixes with our blood an Trees take in harmful gases from the air ang produce oxygen Once_____ oxygen ,the brain dies . We ____ in oxygen in the air Once ___of oxygen ,the brain dies. 英语翻译1.Just as water is the most important of liquids,oxygen 第1题 The two elements water is made are oxygen and hydrogen. When we breathe,the oxygen in the air（） with our blood and g Things are known _when they unite with the oxygen of the air 英语Things are known ______ when they unite with the oxygen of Is oxygen are the only gas____ helps fire burn? 1.The plants can ___ carbon dioxide into oxygen.