Blow hot and cold三心二意；出尔反尔；喜怒无常。
Mary blows hot and cold about her job;every day she changes her mind.
玛丽对于工作的事情总是拿不定注意，今天想这样，明天又想那样。
He tends to blow hot and cold.
他可能拿不定主意。
A:Look,the girl is so beautiful and she is smiling at me.
看！那个女孩真漂亮，她对我笑呢。
B:She is so lovely.
她真可爱。
A:I can't agree with you.she's pretty,but she always blows hot and cold.
我不同意你的看法，她很美，但是她总是喜怒无常。
背景音乐：Smile
