壁垒 bìlěi rampart
rampart; barrier
How to remember 壁垒: 壁 partition + 垒 rampart = rampart.
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How it is used
- A barrier / rampart, mostly figurative - 贸易壁垒 (màoyì bìlěi) trade barriers; 技术壁垒 (jìshù bìlěi) technical barriers; 壁垒分明 (bìlěi fēnmíng) sharply divided into opposing camps.
- The figurative 'barrier to entry' sense dominates in economics and business. Written/formal.