key reaction meaning in Chinese

关键反应
主要反应

They obsered the most common chemical reaction among a family of reactions on the dna molecule that are linked to sunburn , and discoered that this key reaction happens with astounding speed - - in less than one picosecond , or one millionth of one millionth of a second
他们观察到发生被晒伤的dna分子上发生系列反应中最普遍的化学反应，并且发现这种反应速度惊人?至少以每皮秒或者每秒百万分之一的速度。
They observed the most common chemical reaction among a family of reactions on the dna molecule that are linked to sunburn , and discovered that this key reaction happens with astounding speed - - in less than one picosecond , or one millionth of one millionth of a second
他们观察到发生被晒伤的dna分子上发生系列反应中最普遍的化学反应，并且发现这种反应速度惊人?至少以每皮秒或者每秒百万分之一的速度。