还有很多不同类型的非关税壁垒也一直在使用，广为人知的莫过于配额制度。

Many different types of non-tariff barriers have been used, but the best-known of these are quota systems.

youdao

还有很多不同类型的非关税壁垒也一直在使用，广为人知的莫过于配额制度。

Many different types of non-tariff barriers have been used, but the best-known of these are quota systems.

youdao