annular boundary的用法和樣例：
例句
- The boundary condition on the body is transfered to body axis.
物面邊界條件被轉移到物體軸上。 - Moreover, the sound pressure and velocity on the virtual boundaries can be get simultaneity by using this method, which cannot be done by conventional boundary element method.
同時(shí)采用文中的方法還可以同時(shí)得到聲場(chǎng)中非物面邊界上質(zhì)點(diǎn)的振動(dòng)速度和壓力，這是常規邊界元法無(wú)法做到的。
