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从小学进入中学,既是一个学习历程中的一大转折,也意味着一个生理发育重要阶段的到来。在这一时期里,同学们的身高每年都要增高4～6厘米,有的甚至达8～10厘米。体重每年要增加1～2公斤,有的甚至达到4～5公斤。体内心、脑、肝、肾等各类器官生长速度大大加快、肌肉细胞数量增加
From primary school to secondary school, is not only a major turning point in the learning process, but also means an important stage of physiological development. During this period, the students’ height increased by 4 to 6 cm every year, and some even reached 8 to 10 cm. Weight to increase 1 to 2 kg per year, and some even reached 4 to 5 kg. Body heart, brain, liver, kidney and other organs greatly accelerated the growth rate of muscle cells increased