“不发生”的英语可以翻译为：nonoccurrence ...

如果不发生感染,炎症可自然消退.The inflammation may subside sponxaneously if infection does not develop.通常假定反力在垂直切面内不发生变化.It is generally assumed that a reaction does not change in elevation.舵对船不发生作用了.The ship does't answer to the...