... chronological age实足年龄;实际年龄;生理年龄;时龄 chronological method顺时叙述法;编年史写法 Chronological aging年代老化;自然老化 ...
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对缓慢置换，假设的时龄分布函数变得不重要。
For slow replacement the age distribution function assumed is unimportant.
结果表明，在59时龄以内80%以上的卵黄囊营养被吸收利用，说明这一时期是卵黄囊吸收利用的主要时期。
The results showed that more than80%of nutrition in yolk sac were utilized in59hours, which suggested that it was the main period of yolk sac utilization.
只有18 %的美国人认为自己比父母在同一年龄时的境况更差。
Only 18% of Americans think they are worse off than their parents were at the same age.
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