英语语法分析

Then the period is ch... the period is changing.

那么周期。,周期在变化。

Alo on display will be electronic engine control, currently in production to upgrade CH-47 and UH-60 helicopter engine for the U.S. Army and National Guard.

同时展出的还将有发动机控制电子装置，目前正在生产并用于升级美国陆军和国民警卫队的 CH-47 和 UH-60 直升机发动机。

CH-47s pilots in Iraq were told to fly only at night.

在伊拉克的CH-47飞行员被告知只在夜间飞行。