Such policies have not existed before.

此类政策以前没有的。

youdao

But the creation of the post of prime minister, which had not existed, was a victory for Mr Odinga.

但是，创设一个从前不存在的首相职位，是奥廷加先生的一个胜利。

youdao

Next to an American flag stood the flag of South Vietnam, a country that has not existed for 34 years.

在美国国旗旁边立着一面南越(一个存在了三十四年的国家)国旗。

youdao

Now,he says,people must not permit Haiti's poorest citizens to return to the terrible conditions that existed even before the earthquake.

VOA: special.2010.02.05

Because they would have started with the hypothesis, not that there existed a month, but that June was particularly likely.

因为他们是有了假设然后再开始做实验的，而不是说有一个这样特殊的月份，而是六月是一个特殊的月份。

麻省理工公开课 - 计算机科学及编程导论课程节选

The time was in the early 70s, so factory farming was not well-known, was not as dominated as it is today, but it still existed.

那时是70年代早期，工厂化养殖并不为很多人所知,也不如今天这样占主导地位，但当时已经出现了这种方式。

普林斯顿公开课 - 人性课程节选

But the creation of the post of prime minister, which had not existed, was a victory for Mr Odinga.

ECONOMIST: Kenya

Technology involves the creation of radically new things that have not existed, and globalization maps to the continual copying of things that already exist.

NEWYORKER: No Death, No Taxes

But the Commissioner discarded this as an irrelevant argument, since the panel had not existed at the time in April 2009 when the BBC's request was made.

BBC: Thatcher's Hillsborough files must be released