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.
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.
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。
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