HSK 7-9
不可或缺
bùkě-huòquēnecessary; must have
信任是团队中不可或缺的基础。
Xìn rèn shì tuán duì zhōng bù kě huò quē de jī chǔ.
Trust is an indispensable foundation within a team.
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Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.