n.妨碍者；阻扰者；妨碍物
What can we do to prevent the disease spreading? 我们能做什么来防止这种疾病蔓延呢？
The authorities took measures to prevent tax fraud. 当局已采取措施防止偷税漏税。
Does prison do anything to prevent crime? 采取关押方法对制止犯罪有作用吗？
Dust the repair to prevent adhesion to outer cover. 清整修补处以防与外胎粘连。
Stir the sauce to prevent it lumping. 把沙司搅拌一下以免结块。
We should take steps to prevent war. 我们应当采取措施制止战争。
