If the american civil war had not occurred, would slavery have been persistent for the rest of the century ? 如果美国不发生南北战争，奴隶制是否会持续存在到那个世纪末？
Under conditions of easterly flow, therefore, or very large westerly flow no vertical propagation will occur . 所以在东向气流或很大的西向气流的情况下，将不发生垂直传播。
Consider a nation as a collection of islands of economic activity separated by seas in which no activity occurs . 考虑一下这种情况，一个由若干岛屿组成的国家，它的经济活动被不发生经济活动的海洋所分割。
Vaccination with weakened or killed viruses arouses these antigens in exactly the same way, producing immunity without infection . 用减弱了的或者是死的病毒去接种，能同样地引出这些抗体，从而既产生免疫但又不发生感染疾病。
Or more accurately , not happening and not happening 或更确切的讲,总是不发生. .
Object does not have any behavior when it is clicked 对象时该对象不发生任何行为。
Guarantees that classes intended to be immutable 保证那些旨在不发生变化的类
Norecovery specifies that roll back not occur Norecovery指定不发生回滚。
What would our condors feed on if no one was in danger 你不发生危险,那我们秃鹰吃啥呢
This event does not occur when you create a new window 在创建新窗口时，此事件不发生。
