basal area的用法和樣例：
例句
- In the tree crown, the basal area growth of trunk sapwood is approximately equivalent to that of the upper branch sapwood.
在樹冠內，樹榦邊材斷面積生長量與其上部的枝條邊材斷面積生長量大致相等。 - Time dependent calculation for a suddenly imposed pressure gradient has shown that variation of the cross sectional area reduces inertial effect in the contraction flow region.
壓力差為階躍變化的情況下數值計算結果說明了收縮部的斷面積的時間變化減少了收縮部的慣性效果。
