年龄学级表 age-grade table
树龄学 dendrochronology
小学学龄儿童净入学率 the net enrollment rate in primary schools
学龄前儿童 preschool ; preschool children ; preschool-aged children
新加坡爱龄学院 Age Management & Enrichment
学龄儿童 school-age children ; school children
学龄期 School age ; School period ; school years
年龄学级报告表 age-grade report
学龄 school age ; edad escolar
学龄前的 preschool
目的：研究人前磨牙牙髓牙本质复合体的增龄性变化，探讨牙衰老和老年牙病的形态学基础。
Objective: to provide morphological basis for dental aging and senile teeth diseases and to study age-related changes of pulp-dentin complex of human premolar.
方法：对45例不同胚(胎)龄时期的鞍旁结构行组织学连续切片，观察鞍侧腔壁结构及其内容物的形态学变化过程。
Methods: Serial histological sections of 45 human embryos and fetus were performed to observe the development and organization of the contents of the compartment.
目的：回顾探讨老年人的监测血液流变学指标变化与增龄的关系。
Objective: To investigate the changes of hemorheology for old and middle-young-aged persons who were in different age phases.
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