之后，这个“绝佳时期”过去后，儿童再学习其母语之外的语言，就会相对困难很多。
At the later stage, when the "window of opportunity" is passed, the child may face difficulties in learning languages other than his mother tongue.
目的研究儿童遭受车祸后不同时期的心理健康状况及其影响因素。
Objective To examine the prevalence and influencing factors of stress-related disorders in children during different times after traffic accidents.
从出生后至青春期这一年龄段的任何时期均可发病，多在儿童期起病；
The onset age of patients varies from birth to adolescence, mostly in childhood.
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