发热三天英文怎么说呢

"发热三天"在英文中可以翻译为"having a fever for three days".

来源：这句话中的"发热"和"三天"都是英文中常用的词汇，"发热"在英文中可以用"have a fever"来表示，"三天"则可以用"three days"来表示。

英文例句：

I've had a fever for three days now and I'm feepng really weak.
He's been having a fever for three days and the doctor says he needs to stay in bed and rest.
My son has had a fever for three days and I'm starting to get worried.

中文翻译：

我已经发热三天了，感觉很弱。
他已经发热三天了，医生说他需要卧床休息。
我儿子已经发热三天了，我开始担心了。