fertilization age
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各足骨骨化灶范围随胎龄的增加而增大，骨化值与受精龄呈显著的正直线相关。
The range of the foot bone ossification sites increased with the fetal age, and there was an obvious positive linear correlation between the ossification degrees and the conceptional age.
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受精龄是指从受精之日为起点推算胚胎龄，受精一般发生在末次月经第一天之后的两周左右，故从受精到分娩大约38周。
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