n.流行性感冒

I got flu and was out of commission for a week. 我得了流感，一星期沒工作。

The school was closed because of the flu. 因為流行性感冒全校停止上課。

I caught a flu and had to lie in the bed. 我得了流感，不得不臥床休息。

His flu infected his wife. 他把流行性感冒傳染給妻子。

I've been laid up with flu for a week. 我患流感已在家休息一個星期了。

flu是influenza的縮寫，常與定冠詞the連用，但在英式英語中也常省略the。