大学英语：Heavy fog kept the ships from

　　1）Heavy fog kept the ships from being discovered by the enemy.　（大雾使得船只未被敌人发现。）

　　2）We had no way to keep him from getting involved in the matter.　（我们没有办法使他不卷入那事件中去。）

　　3）那种药使他的咳嗽不再加剧。　（The medicine keeps his cough from getting more serious.）

　　4）当地人的保守思想使得那个地方不能快速发展。

　　（The local people's conservative mind keeps that place from developing rapidly.）