Organic certification in countries such as the UK and Australia still presents an insurmountable barrier to most African exporters, the report points out.

报告指出，对于大多数非洲出口商来说，有些国家比如英国和澳大利亚的“有机认证”，至今仍然无法逾越的贸易壁垒。

youdao

Beyond language barriers, there exists an insurmountable artistic preference barrier.

除了语言障碍，还有不可逾越的文化壁垒。

youdao

Casey Lartigue of the Cato Institute points out that, in most cities, the teachers' unions are an almost insurmountable barrier to radical change.

ECONOMIST: School vouchers