1. Oxygen is one of the important elements in the physical world,which is very active chemically.
氧气作为自然界的重要元素之一,有着异常活跃的化学性质。
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.
该发现同样可以引导适当药物去攻击特殊种类的癌细胞,从而减少对那些会伤害组织细胞的化学疗法或放射性疗法的依赖。
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.
用热水浴对它加热几分钟,待冷却后,滴入1~2滴的氯化铁,就可以变成紫红色。