The old are apt to catch a cold.

老人容易患。

You are in danger of catching cold.

有患的危险。

In his weakened condition, he is very susceptible to cold.

他身体很弱, 因此很容易患。

Children are liable to catch cold.

小孩易患。

She is prone to colds.

她易患。

Fatigue predispose to colds.

疲劳易使人患。

Fatigue predisposes one to colds.

疲劳使人易患。