central portion的用法和樣例：
例句
- The elastic modulus of the center portion is higher than elastic moduli of the entering portion and the exit portion.
中央部的彈性模量高於進入部和離開部的彈性模量。 - As a result, however, an official from the central government propaganda department visited from Beijing and accused Ma of publishing an "inappropriate" and "false" story.
然而，結果卻是，一個來自北京中央部宣傳部門的官員到訪並且指控馬做了一個不適當而且錯誤的報道。
