You will be able to take ten dozen bottles free of duty through customs.

你可以携带120瓶免税通过海关。

《柯林斯英汉双解大词典》

Trade within a country is ordinarily free of the obstructions of strange language, customs, and commercial laws, but these obstructions may be greatly involved in international trade.

国内贸易一般不会涉及到语言障碍，关税限制和商业法律的制约，但是在国际贸易中这些障碍就普遍存在了。

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Other for education and health care, would have been almost all free, generous welfare Gao Rizi ensure, satisfaction of the people's livelihood, the customs is simple.

其他对于教育和医疗，也几乎是全部免费，高福利待高日子确保，民生满意，风俗朴素。

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Under the rules of the Southern African Customs Union, a fledgling free-trade area, cars made in Botswana can be exported to South Africa almost duty-free.

ECONOMIST: The desert booms

But Domingo Cavallo, Argentina's new economy minister, has talked (though not publicly) of Mercosur scrapping its customs union, and becoming simply a free-trade area.

ECONOMIST: Another blow to Mercosur

It has a free-trade deal with the block, but is not part of the supposed customs union.

ECONOMIST: Another blow to Mercosur