blow hot and cold

基本解释

But now you disbelieve me. So you men often blow hot and cold.
可是，现在你又对我心怀疑虑，你们凡人就是这样反复无常啊！
Eg. Sometimes it takes me a long time to make up my mind about something but I don't often blow hot and cold.
有时要花好长时间才下决心去做一件事，但决心一下，我就不轻易改变它。
He was not prepared to entertain, or even mix with, someone who could ‘blow hot and cold from the same mouth’.
他没有准备好招待，甚至没有准备好和那些可以“从同一张嘴里既吐出冷气又吐出热气”的人相识。

In fact, there's a rabbinic image, there's a rabbinic tradition that talks about this period of time, and has God and Moses talking, and God says: Listen, between the two of us, whenever I blow hot, you blow cold, or when I pour hot water, you pour cold, and when you pour hot, I'll pour cold, and together we'll muddle through, and get through here.
事实上，这里有一个与犹太律法相关的意象，犹太律法传统,描述了这段时间中，上帝和摩西又一次谈话，上帝说：“听着，在我们两个人中间，当我吹热风，你要吹冷风，当我泼热水，你要泼冷水，当你泼热水的时候，我们泼凉水,我们将一起应付各种情形。
耶鲁公开课 - 旧约导论课程节选

In a country that used to blow hot and cold over America, Mr Lee has never wavered—even when he faced anti-American riots over beef in 2008.
ECONOMIST: America and South Korea
Of course it takes two to Tango, and the LDP and Komeito blow hot and cold toward the idea (currently more cold) so this is an outside possibility.
FORBES: As Prime Minister, Noda May Offer Something New
No one can say with certainty how much influence it has on the main political groups, including the one loyal to Mr Sadr, on whom Iran's government seems to blow hot and cold.
ECONOMIST: Iraq, Iran and the United States

to sometimes like or be interested in something or someone and sometimes not, so people are confused about how you really feel