Their marriage went downhill after the first child was born.

自第一个孩子出生后他们的婚姻便开始走下坡路了。

《牛津词典》

The first child to touch the tree would get a sweet treat.

第一个摸到这棵树的孩子会得到一份糖果。

youdao

The first child in a list, required for CSS styling.

列表中的第一个子代，CSS 样式需要。

youdao

She never forgot these days. Later in life, she wrote: "No deaf child can ever forget the excitement of his first word.

VOA: special.2009.11.08

Peter was the first child of his father's second wife and thus a potential threat to the ambition of the relatives of the first wife.

彼得是他父亲与其第二任妻子的长子,因此对第一任妻子的亲戚们而言,彼得是他们的一个潜在威胁

耶鲁公开课 - 欧洲文明课程节选

He said the first sounds he could remember as a child were those of the Army: the sounds of horns, drums and soldiers marching.

VOA: special.2009.05.24

But he's not the first child of a space traveler to leave the planet.

NPR: Millionaire Follows Dad's Footsteps �� Into Space

Men and women have very similar career patterns up to the point of the birth of the first child.

CNN: Want more female execs? Sort out the household chores

The first child is worth the most, with diminishing benefits for more children.

FORBES: Earned Income Tax Credit (EITC) Punishes Marriage