The form is various, too, which mainly includes green tariff system, green technology system, green packing system, green anti-allowance system and environment quota system and so on.
其形式也多种多样，主要有绿色关税制度、绿色技术标准制度、绿色包装制度、绿色反补贴制度、环境配额制度等。
NAFTA converted Mexico's import license system for corn into a 15-year tariff rate quota (TQR).
NAFTA将墨西哥的玉米进口许可证制度转化为关税配额制度，并在15年内逐步取消。
NAFTA converted Mexico's import license system for corn into a 15-year tariff rate quota (TQR).
NAFTA将墨西哥的玉米进口许可证制度转化为关税配额制度，并在15年内逐步取消。
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