两者的存在都有其绝对的必然性，不过，当然咯，各自的存在和运转都有自己的法律和规则。
Both exist with absolute certainty, though of course each exists and operates according to its own set of laws and principles.
这是很多喝无糖饮料者的理由，不幸的是，目前有研究表明，体重增加和人造甜味剂产品之间很有可能存在必然的联系。
This is the popular line of reasoning for many diet soda drinkers. Unfortunately, current research indicates a possible link between artificial sweetener consumption and weight gain.
也就是说，只要存在不同语言，必然存在不同语言使用者之间程度不一的翻译活动。
That is to say, if there are different languages, there must be different level of translation activities among the different language users.
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