“不至于”的英语可以翻译为：can't go so far as to，not so ... as to ...，not to such an extent as to，（未必） be unlikely to ...

我们不要把市场看成单一的、不变化的,市场不是不见棺材不掉泪,不撞南墙不回头的.It's not without hesitating and never turns back unless knocking into the wall....

“不适合”的英语可以翻译为：unsuited，inadequacy，inconvenience，disagree with，inconformity ...

不要紧，他仍是众人心目中的英雄。No matter, he remained the hero of the crowds.不要紧，别哭了。It's all right. Don't cry.不要紧, 我相信你下一次一定能做得好些的.Never mind, next time I'm sure you can do better....

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...