The weather is now hot, now cold.

天气忽而冷忽而热。

《新英汉大辞典》

What strange weather here -- now cold, now hot.

天气真是邪门儿， 一会儿冷一会儿热。

《新英汉大辞典》

The weather is now hot, now cold.; It is sometimes hot and sometimes cold.

天气时热时冷。

《新英汉大辞典》

Now that he had stopped, cold was forcing his blood to withdraw deeper into his body.

VOA: special.2010.05.01

Now, just to give you a sense of how cold and calculated this business was, and how in many ways the first defense or justification of slavery in America is of course it certainly is by the late Antebellum Period it is an unabashed economic defense, as we'll see.

以上只是为了让你们体会到,这种交易是如何的冷酷而精明,以及战前后期第一次,美国奴隶制度的保卫与正名之战,不管怎么看,都毫无疑问,是一场赤裸裸的利益保卫战,正如我们所见

耶鲁公开课 - 美国内战与重建课程节选

Now a cold-hearted person is someone who has no sympathy.

VOA: special.2009.12.13

Now the cold war is over the old world has not changed quickly enough.

BBC: India's nuclear tests: cause for concern?

Or, as Colin Powell put it, it is not just that the Cold War is over - now the post Cold War is over too.

BBC: Shanghai showcase

By now, the cold fear of the financial crisis has receded, even if its effects linger.

NPR: So The Dow Hit A Record; Now Where Do We Go?