Olsen's theory states that regional groups would be restrictive to the various special interest groups of the member nations and facilitates the enhancement of the nations' economic efficiency.

奥尔森的理论表明，区域集团会对成员国的各种特殊利益集团形成约束，促进各国经济效率的提高。

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There are now more than 15 000 professional lobbyists in Washington, representing a variety of economic and other special-interest groups.

目前有超过15万名的专业说客在华盛顿，代表着经济和其他特殊利益集团等。

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There are now more than 15 000 professional lobbyists in Washington, representing a variety of economic and other special-interest groups.

目前有超过15万名的专业说客在华盛顿，代表着经济和其他特殊利益集团等。

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