Swimming on a hot day is sheer bliss.

热天游泳是天大的乐事。

《牛津词典》

Taking a cool bath or a shower can feel really good on a hot day.

在热天洗个冷水澡或淋浴会感觉很好。

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There's one sound that gets a big reaction from kids on a hot day, the sound of an ice-cream truck.

在炎热的天气里，孩子们听到一种声音时会有强烈反应，那就是冰淇淋车的声音。

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"So I believe I'd better give a hot Brazilian kiss. It would be better on the Day of the Couple."

VOA: special.2010.02.08

Especially on a day like this, a nice, hot, sunny day like this, the park's a lot busier.

特别是在一个这样的日子，美好的、温暖的、阳光的一天，公园会更热闹。

海德公园的氛围 - SpeakingMax英语口语达人

If you miss a bottle or two on a hot day, then it could be game over.

BBC: SPORT | Other Sport... | Cycling | Armstrong 'has only three rivals'

Exhaust from the engine consists of harmless atmospheric air, cold enough to serve as air-conditioning on a hot day.

FORBES: Driving on Air

It is often served in a stainless-steel cup and, along with some people-watching, makes a perfect post-train-ride break on a hot day.

BBC: Riding the rails like a Mumbaiker