新东方在线：考研英语核心词汇78
by birth 在出生上,论出身,按血统at birth 在出生时;
give birth to 出生
造句：
I'm a Chinese by birth.
我生在中国,是个中国人。
Man's nature at birth is good.
人之初，性本善。
Adeline Alvarez married at 18 and gave birth to a son, but was determined to finish college.艾德琳•艾华里斯18岁结婚并生有一子，但她决心要读完大学。
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