I first encountered DFA several years ago when I worked on regular expressions, but it has been at least three years since I last used them so I spent some time researching the subject.
几年前，我在处理正则表达式时，第一次遇到了DFA，但是我已经至少有三年没有用过它，所以我花了一些时间来研究它。
Since animal experimentation has been legal for some time and civilization has not yet ended, it seems particularly clear that this chain of events won't necessarily take place.
动物试验已经有一段时间了，而我们的文明并没有终结，看起来该论证的一系列事件并没有发生。
It's been some time since AC2 was released, and it's likely that it has sold perhaps 80% of the units it was ever going to.
刺客信条2已经发布了有一段时间了，据说游戏的销量已经达到预期的80%。
Most cosmologists believe that the Universe, and with it space and time, exploded into being some 13.7 billion years ago at the Big Bang, and that it has been expanding ever since.
很多宇宙学家都相信，宇宙及其空间和时间，在大约137亿年前自大爆炸而扩展开来，并且一直膨胀至今。
It has been quite some time since we have talked about these matters.
我们上次谈论这些事情至今已过了好长时间了。
Since C-OEM is very cheap, some resellers may recommend this products, but it will be illegal if your PC has been purchased for a long time.
由于C -OEM比较便宜，有些经销商可能会向您推荐，如果您不是新购的PC，这是完全不合法的。
It has been quite some time since I was last in London.
我上次离开伦敦至今颇有一段时间了。
It has been quite some time since I was last in London.
我上次离开伦敦至今颇有一段时间了。
应用推荐