It is not hot in the house, but it's really hot outside.

屋子里不热，外面才热呢！

《新英汉大辞典》

BLACK ROCK CITY, Nevada — It's hot in the desert, but not too hot to set something on fire.

黑岩市，内华达州——炎热侵袭着荒漠，但如此酷热却还不至于将物体点燃。

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However, it is not advisable to use hot update in real time system, because hot update could result in the system leading into an unknown state.

不过，在实时系统中使用热更新并不明智，因为热更新可能导致系统进入未知状态。

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You may tell a friend that the new play you saw last night is not so hot.

VOA: special.2009.12.06

The thermos, with the lid on top, It's not a open system your coffee is going to stay warm or hot in the thermos.

顶部盖了盖子的热水瓶，不是开系,你希望你的咖啡在热水瓶里面保持温暖,或滚烫。

麻省理工公开课 - 热力学与动力学课程节选

but it's not really, really hot. It might get hot like in end of August.

但是不会真的很热，可能会像八月底一样。

关于伦敦的天气 - SpeakingMax英语口语达人

It is Fashion Week in Paris right about now, but perhaps we take a look at the markets to get a glimpse of the hot and not so hot trends for the year.

FORBES: URBN Pummeled, But Fashion Holds Credence In Stock's Value

They tend to capitalize on investing fads (recently, dot.coms), and what's hot today might not be hot tomorrow.

FORBES: Trick or Track?

In brewing the tea the water should be hot, but not too hot.

ECONOMIST: The fake cuppa