Sadness and irritability can occur at any age from infancy to very old age.
悲伤和易怒可能出现在任何年龄层，从婴儿到白发苍苍的老人。
At Present, research on security in MANET is still in its infancy.
目前对其安全性的研究还处于起步阶段。
Children treated during infancy or early childhood are at the highest risk.
被治疗的孩子处于婴儿期或幼年时期是高度危险期。
At that time aviation was still in its infancy.
当时航空仍在萌芽阶段。
At present, the disclosure of environmental information is still in its infancy.
目前，我国对环境信息的披露还处于起步阶段。
At present, the disclosure of environmental information is still in its infancy.
目前，我国对环境信息的披露还处于起步阶段。
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