pre‧vent S2 W1 / prɪvent / 动词 [及物动词]

to stop something from happening, or stop someone from doing something :

The rules are intended to prevent accidents.

prevent somebody/something (from) doing something

His back injury may prevent him from playing in tomorrow’s game.

We were prevented from entering the site.

Wrap small ornaments in paper to prevent them being damaged.

— preventable 形容词 :

preventable diseases

Every one of these deaths is preventable.

Register

In everyday English, people usually say stop somebody/something (from) doing something rather than prevent somebody/something (from) doing something :

This barrier is to stop people from coming in without a ticket.