rule out
1． declare the impossibility of； exclude 排除；表示不可能；不把…考虑在内
We can not rule out the possibility that he'll come after all．我们不排除他最终会来的可能性。
Anyone who has entered for the same competition before is ruled out according to the regulations．凡以前参加过同样比赛的人，按照规则均不得参加。
The doctor took Xrays to rule out the chance of broken bones．医生拍了X光片，以排除骨折的可能性。
That idea can be completely ruled out．那种想法可以完全排除。
2．not allow ；decide against； prevent不允许；反对；阻止
The principal ruled out dances on week days．校长不允许在周末以外的时间跳舞。
A sudden storm ruled out the boat race．突然来的暴风雨使划船比赛无法进行了。