HSK 7-9
口岸
kǒu’àn名
a port for external trade; a trading or transit post on border between countries
这个边境口岸全天开放。
Zhè ge biān jìng kǒu àn quán tiān kāi fàng.
This border crossing is open around the clock.
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Appears across levels (7-9) in the HSK 3.0 word list.