控制生育时间的英文：
timing of birth
n. 定时；时间选择；时机掌握
discrimination time
辨别时间辨别时间
It is time to go.
该走了。
They are not in step with the times.
他们跟不上时代的步伐。
This was for the time only.
这只是一时的权宜之计。
What for this time?
这次又是为什么？
n. 出生；血统，出身；起源
Being authentically or genuinely such by birth.
纯种的出身纯正或血统纯净的
To give birth to(a calf).
生下（小牛崽）
There is a royal proclamation of the birth of the prince
那有一张王室的公告，宣告王子诞生了。
He is of humble birth.
他出身卑微。
He is a man of low birth.
他出身低微。