central portion的用法和样例：
例句
- The elastic modulus of the center portion is higher than elastic moduli of the entering portion and the exit portion.
中央部的弹性模量高于进入部和离开部的弹性模量。 - 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，结果却是，一个来自北京中央部宣传部门的官员到访并且指控马做了一个不适当而且错误的报道。
