They were also having their first periods, on average, three months earlier.

她们的首次例假平均也提前三个月。

youdao

But the chimpanzees have territorial fights, and females typically leave their native group before having their first babies.

但是黑猩猩经常会为领土而战，雌性黑猩猩经常在她们产第一个孩子的时候就离开了原来的群体。

youdao

People just diagnosed with type 1 diabetes may be able to wait a few years before having their first dilated eye exam, but then should have one every year after as well.

而对于刚确诊为1型糖尿病的患者，他们不必急着进行第一次眼科检查，可以先等几年，但是此后也应每年检查一次。

youdao

Thousands of medical students face having their first hospital job offer withdrawn because of marking errors in their exams.

BBC: Junior doctor

But the rest of Britain's Olympians will act as mentors to a squad featuring many having their first taste of international competition.

BBC: SPORT | Other Sport | Davies leads British Euro squad

Some say it could be partly blamed on the fact that many women are choosing to delay having their first child.

BBC: Cancer cases on the rise