有关二十世纪三十年代贸易壁垒的数据踪迹难寻。
Comprehensive data on 1930s trade barriers are hard to find.
在21世纪的国际贸易中，关税壁垒的作用已大大削弱。
In the 21st century, the function of tariff barrier has greatly weakened in the international trade.
十九世纪等级制度的森严壁垒，大都被冲破了。
The barriers of the old 19th century class system are in many ways being broken down.
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