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Stroke order
骨干 is written in 12 strokes across 2 characters.

- 骨 — 9 strokes
- 干 — 3 strokes
Senses
- diaphysis (long segment of a bone)
- fig. backbone
Related words
骨干 is pronounced gǔgàn and means “xương sống”. You will meet it in HSK 6, a band of the Hanyu Shuiping Kaoshi — the standard test of Chinese proficiency. Most learners can pick 骨干 out of a list long before they can reach for it unprompted, and the gap between those two closes only with repeated recall. LexiTrail schedules the next sighting from how well you did on the last.