primary valence

• 舟

primary valence的用法和样例：

例句

1. Acute unstable scaphoid waist fractures are a second indication for primary internal fixation of the scaphoid and a relative indication for percutaneous fixation.
   急性不稳定型舟状骨骨折是第二个内固定适应症，是经皮固定的相对适应症。