关键生长期:是指机体器官组织的生长发育或某种知识、行为经验的获得或形成，在某一特定时期或阶段中最敏感，此时的正常发育受到干扰，常成为永久性缺陷或功能障碍，这一时期称为关键生长期。
有关胆固醇值，医生长期以来主要关注以下三个关键数值。
On the cholesterol front, doctors have long focused on three key Numbers.
生殖生长期间的光照强度是决定大豆产量的关键环境因素。
Light intensity during the reproductive period is the key environmental factor determining soybean yield.
果实第二次缓慢生长期与果实硬核期相吻合，果实第一次迅速生长期和第二次迅速生长期是果实增长的两个关键时期。
The second slow growth period of fruit inosculated with the rigidification period of stone, and the first and the second fast growth period of fruit were two pivotal periods for fruit to grow.
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