The primary school is basic stage of compulsory education and key period of forming good study habits, it is the period of laying a foundation of one's growing up too.

小学是义务教育的基础阶段，是一个人形成良好学习习惯的关键时期，也是一个人成长的奠基时期。

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Root-extended period is the key period of root growing, moderate deficit irrigation can boost the depth of root;

伸根期是烟草根系生长的关键时期，进行适度的调亏灌溉，可以促进烟草的扎根深度；

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There was a sharp rise in assignment procrastination in the junior, indicating junior was a key transforming period of the total growing of undergraduates' academic procrastination;

大学生的作业拖延随年级升高日趋增加，大学二年级是作业拖延迅速增加的转折期；

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