Most forms of the common cold and flu are caused by viruses.

大部分的普通感冒和流感都是病毒引起的。

Infectious bronchitis generally begins with the symptoms of a common cold: runny nose, sore throat, fatigue, and chilliness.

感染性支气管炎起病时，一般具有普通感冒症状：出现流鼻涕、喉痛、疲乏和寒战。

She doctored herself for just a common cold.

她自己治好了自己的一般感冒。

Cold sores aren't caused by the common cold.

疱疹并不是由感冒引起。

Like the common cold, it spreads through the air.

与普通感冒一样，该病经空气传播。