boundary region的用法和樣例：
例句
- Friction increases with increasing fiber surface roughness in the boundary and semiboundary.
在邊界和半邊界區內，摩擦隨纖維表面粗糙度的增加而增加。 - Beyond the boundary layer, the motion is highly irregular.
超出邊界層以外，流體的流動非常沒有規律。 - Actual humidity measurements in the boundary layers have been made with a microwave refractometer.
實際上已經用微波折射儀測定了邊界層中的濕度。
