许多因素可以导致胎儿发育迟缓。
Many factors can lead to growth retardation in unborn babies.
两兄弟，其中一个智力发育迟缓，他们想抢劫。
There were two brothers, one of them retarded, and they get into a robbery.
无人看管时，婴儿就会感觉不愉快，这会导致大脑发育迟缓。
Unattended, baby will feel unhappy, it will lead to a brain retarded.
露西在智力方面发育十分迟缓，至今还不识字。
露西在智力方面发育十分迟缓，至今还不识字。
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