prevent 
英 [prɪˈvɛnt]  美 [priˈvɛnt] 
v. 阻止，妨碍；防止

例句：
Exercise helps prevent heart disease. 

体育锻炼有助于预防心脏病。

The UN still hopes to prevent war. 

联合国仍然希望阻止战争发生。

Many accidents could be prevented if motorists would slow down. 

如果开车的人放慢速度，很多交通事故都是可以避免的。

He said this would prevent companies from creating new jobs. 

他说这会妨碍公司创设新的工作岗位。

The police have been trying to prevent them carrying weapons. 

警方一直在设法阻止他们携带武器。