The reason why many seeds require a period of stratification is to guarantee that the seeds grow after and not before unfavorable weather.

许多种子需要一段时间分层的原因是为了保证种子在恶劣的天气来临之后而不是之前生长。

youdao

Good news at last, it seems, and not before time.

最后，这貌似是个好消息，但在不恰当的时机却非也。

youdao

Why do you want to get more healthy now and not before in your life?

你为什么现在想要变得更健康而过去却未考虑？

youdao

But the man did not move. He heard that unearthly cry upon his failing sense, again and nearer than before.

VOA: special.2011.02.26

Just a quick check and this is not for the camera, how many of you have seen Bertrand competition before?

我们迅速了解一下,这不是为了录影,你们谁之前学过伯川德竞争

耶鲁公开课 - 博弈论课程节选

But as I said before, the food environment has changed very quickly and people have not.

但是就像之前说的,食品环境改变迅速,而人却没有

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The UN has recently, and not before time, decided that population control should be one of its much-vaunted Millennium Development Goals.

ECONOMIST: Population control

The Supreme Court today rejected Anil's plea, saying that the date of the final hearing will be decided on September 1 and not before.

FORBES: The Ambani brothers are at it again.

Nor has it changed an already announced delay in Crestor's launch--the drug is still expected to go on the market in the fourth quarter, and not before.

FORBES: AstraZeneca's Crestor Still In Question