定理3 揭示了实函数与第一纲集的某种关系。
Theorem 3 reveals some relation between real function and meager.
《水经注》是我国第一部以记载河道水系为纲的综合性地理名著，记载了中国古代大量的自然、人文资源。
On the River Systems is the first famous comprehensive work of geography of our country which gives an account of a vast amount of natural and cultural resources of ancient China.
本公司一贯以“质量为纲、信誉至上、价格优惠、服务第一”的经营理念。
Our company always sticks to the business philosophy of quality as the key link, credibility foremost, and price concessions, service first.
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