It's hot out – very hot, very humid.

外面热烘烘的–非常热，非常潮湿。

《柯林斯英汉双解大词典》

It's really hot out here and I am very thirsty.

就是现在太热了，我很渴。

youdao

Even if it isn't hot out, warm up for no more than 15 to 20 minutes.

即使外面不是很热，也不要超过15 - 20分钟。

youdao

They are now discovering strange, new species of plants, animals and organisms surviving near hot currents that come out of the ocean floor.

VOA: special.2009.01.13

You couldn't just run something successfully in a cycle and get work out of it, using the heat from the hot reservoir, without also converting some of the heat that came in to heat that would flow into a cold reservoir.

如果一样东西在循环工作过程中,只有热从高温热源中流出，而没有热流入低温热源，那么此过程,不可能对外做功,不可能把所有热。

麻省理工公开课 - 热力学与动力学课程节选

Hey, check out that chick. She's really hot. Let me go talk to her."

嗨，看看那个女孩，她真的很火辣。我要过去和她说说话。”

体验男女初次会面 - SpeakingMax英语口语达人

If it's hot out and he's playing a monster hitter, he'll bring more rackets on the tighter side.

WSJ: Roger Federer: With Tennis Rackets, He Strings Them Loose

We know it's hot out there, and there's a tendency for it to get a little stormy, but it's not all that often that we actually get to see it in action.

ENGADGET: Alt-week 9.8.12: Moon farming, self powered health monitors and bringing a 50,000 year-old girl to life

Perch at a table on the pavement if it is not too hot out and order a dangerously addictive cheese manakish (thick Arabic bread warmed and topped with melted cheese) for six dirhams.

BBC: Affordable Dubai