neutral trim的用法和样例：
例句
- This paper introduces the trim aerodynamic characteristics of re-entry modules.
本文主要介绍小升阻比载人飞船返回舱的配平气动特性。 - Based on the model, according to the parameters of a medium type autogyro, the trim and control response characteristics are calculated.
在此基础上，根据某中型旋翼机基本参数，对该机进行了配平及操纵响应特性计算。
