196.四种“病状”。flu，fever，cold，cough
（1）flu：流感。如：
There's been a lot of flu going around.
最近流感非常严重。
（2）fever：发烧。如：
My brother has had a fever for three days.
我哥哥发烧三天了。
（3）cold：感冒。如：(https://www.daowen.com)
It's easy to catch a cold this winter.
今年冬天容易感冒。
（4）cough：咳嗽。如：
He has a bad cough.
他的咳嗽很严重。