骨干 Traditional 骨幹 gǔ gàn 🔊 diaphysis (long segment of a bone) HSK 7–9 + Review this word Meanings gǔ gàn 骨幹 diaphysis (long segment of a bone)fig. backbone Its characters 骨gǔbone干gàntree trunkHSK 3 Words with 骨干 骨干网 gǔ gàn wǎng backbone network