No one foresees how the necessary restriction of the population will be effected.

任何人都无法预知将如何实现对人口的必要限制。

youdao

Since the costs of science were rising faster than inflation, some restriction on funding was necessary.

既然科学成本上涨快于通货膨胀，资助上的一些限制是必要的。

《柯林斯英汉双解大词典》

I'll explain why this restriction is necessary later in this article.

我将在本文后面解释这一限制的必要性。

youdao

We will take whatever steps are necessary to protect Caster's right to compete without restriction.

CNN: Semenya's lawyers say they will protect her right to race

By downloading only what's necessary at the moment, the client overcomes the Blu-ray program size restriction and delivers what customers have already come to expect from leading Korean IPTV and cable companies using the software in their STBs.

ENGADGET: Dreamer's Biddle makes Blu-ray players a way around your cable company?