1. Oxygen is one of the important elements in the physical world，which is very active chemically.
氧气是自然界最重要的元素之一，它的化学性质很活泼。
2.The finding could also lead to drugs tailored to attack specific types of cancer; thereby lessening our dependence on tissue-destroying chemotherapy and radiation.
这项发现还能制造出专门对一些特殊种类的癌症起作用的药物，从而减少我们对损伤组织的化疗和放射疗法的依赖。
3.Heat it with hot water for several minutes，cool，and add 1or 2 drops of ferric chloride TS：a violet-red color is produced.
使用热水浴将其加热数分钟后冷却，滴入一至两滴氯化铁，将会产生紫红色。（TS是什么。。。）
