That which has necessary existence and not contingent existence.
存在的东西总有其存在的理由。
A necessary and sufficient condition of the existence of prime model is proved.
研究了主型的有关性质,证明了一个素模型存在的充分必要条件。
Air and warmth are necessary for existence.
空气与温暖是存活所需要的。
So I must consider marriage as a necessary step in my new existence .
所以我要想到结婚,在我以后的生活中那是一项应有的节目。
This only testifies to one aspect, which is also a necessary condition, of human existence.
这仅仅只例示着人类生存的一个侧面,亦即人类生存中的一种必要境况。
This only testifies to one aspect, which is also a necessary condition, of human existence.
这仅仅只例示着人类生存的一个侧面,亦即人类生存中的一种必要境况。
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