HSK 7-9
骨干
gǔgàn名
diaphysis (long segment of a bone); fig. backbone
这些青年已成为团队骨干。
Zhè xiē qīng nián yǐ chéng wéi tuán duì gǔ gàn.
These young people have become the backbone of the team.
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Appears across levels (7-9) in the HSK 3.0 word list.