n. 流行性感冒，流感
flu可以用作名词
flu是influenza的缩写，常与定冠词the连用，但在英式英语中也常省略the。
flu用作名词的用法例句
I got flu and was out of commission for a week.我得了流感，一星期没工作。
The school was closed because of the flu.因为流行性感冒全校停止上课。
I caught a flu and had to lie in the bed.我得了流感，不得不卧床休息。
1、One of the office girls was down with the flu.
一位女职员得了流感。
2、Withdrawal from heroin is actually like a severe attack of gastric flu.
戒断海洛因的过程实际上就像患了一场严重的胃肠型流感。
3、Three members of the band went down with flu.
这个乐队有3名成员得了流感。