大部分的普通感冒和流感都是病毒引起的。
Most forms of the common cold and flu are caused by viruses.
虽然流感和普通感冒有许多相似之处，但还是有一些能找得到的明显迹象。
Although the flu and common cold have many similarities, there are some obvious signs to look for.
虽然吸锌片已经被推广为治疗普通感冒的药物，但研究显示并没有一致的效果。
Though sucking zinc lozenges has been promoted as a treatment for the common cold, research has revealed no consistent effect.
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