HSK 7-9
壁垒
bìlěi名
rampart; barrier
技术壁垒阻碍了企业合作。
Jì shù bì lěi zǔ ài le qǐ yè hé zuò.
Technical barriers hindered cooperation between the companies.
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Appears across levels (7-9) in the HSK 3.0 word list.