A contract between two countries is called a treaty.

两个国家之间的合同叫条约。

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Under the patent Co-operation Treaty, the two parties sign the contract.

双方按照专利合作条约签订了该合同。

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The professional athlete are those who must observe the required rigorous treaty when they sign the contract and serve for the clubs, besides taking a generous sum of annual salary.

欧美国家的职业运动员在俱乐部里签约服役，除了拿丰厚的年薪外，还得遵守苛刻的限定条约。

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The change is being caused by the expiration of the HEU-LEU contract, signed in 1993 by Russia and the US. The treaty, which expires in 2013, allowed the duty-free export of Soviet uranium extracted from nuclear warheads.

FORBES: Forget Gold and Oil, Buy Uranium!