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Economists think of knowledge, unlike physical goods, as "non-rival" : use by one person does not necessarily preclude use by others.

经济学家认为知识并不像有形产品，是具有非竞争性的：一个人使用并不会排除他人使用。

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His rival, Boyd, 53, said about two-thirds of Priceline's bookings are non-U.S.

他的竞争对手53岁的Boyd表示，Priceline三分之二的预订来自于美国境外。

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That leaves conflicts that rage in weak and failing states (as in parts of Pakistan and Afghanistan), or in ungoverned space (in parts of Somalia), where rival non-state actors, terrorist groups, militants and warlords do battle.

ECONOMIST: Civilians in conflict

And the Internet remains what it always was, crawlable and indexable by rival commercial and non-commercial search engines and those yet to be created.

FORBES: Lesson From The Google Case: There Is No Such Thing As Antitrust Policy

Europe's leading insurance companies rival it in terms of non-life premiums written and balance-sheet oomph.

ECONOMIST: Lloyd's of London