HSK 7-9
瓶颈
píngjǐng名
neck of a bottle; (fig.) bottleneck; problem that impedes progress
缺少人才成为发展的瓶颈。
Quēshǎo réncái chéngwéi fāzhǎn de píngjǐng.
A shortage of skilled people has become a bottleneck to development.
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Appears across levels (7-9) in the HSK 3.0 word list.