at birth的用法和樣例：
例句
- The position of the fetus in the uterus at birth with respect to the mouth of the uterus.
產位，(胎兒)先露位置分娩時胎兒在子宮中相對於子宮口的位置 - Man's nature at birth is good.
人之初，性本善 - A congenital condition characterized by the incomplete expansion of the lungs at birth.
肺膨脹不全一種先天性疾病，特徵為出生時肺部不完全膨脹 - The baby weighed seven pounds at birth.
那嬰兒出生時重七磅。
