【解】diaphysis; diaphyses(plural)

主要的人或事物backbone

• 基本骨干

  mainstay

• 训练骨干

  train core staff

• 文艺骨干

  mainstay of art and literature

• 骨干企业

  key enterprise

• 骨干教师

  key teacher

• 起骨干作用

  be a mainstay

• 领导重视，骨干带头。

  The leadership takes things seriously, while key personnel take the initiative.