The old are apt to catch a cold.

老人容易。

You are in danger of catching cold.

你有的危险。

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

他身体很弱, 因此很容易。

Children are liable to catch cold.

小孩易。

She is prone to colds.

她易。

Fatigue predispose to colds.

疲劳易使人。

Fatigue predisposes one to colds.

疲劳使人易。