0ne is know as the one-child policy.

0ne is know as the one-child policy.
0ne is know as the one-child policy.

0ne is know as the one-child policy.
上面翻译太死板,团长给你翻译吧,计划生育/独生政策众所周知.known才对,都be动词了.综合外语翻译太死板,所掌握语言比咱团少,别浪费了,有不懂问题就问我,或者加团群,多答题少提问.