英语语法分析

When they go out of Rader range they become invisible again.

当他们走出国门，雷德范围，他们再次成为无形。

A new antenna of Doppler acoustic rader was designed for convenience in field experiment.

为了便于野外试验，对多普勒声雷达天线作了重新设计。

An air traffic controller noticed on his rader screen that the two planes were too close to each other.

一名空中交通控制员从他的雷达屏幕上观察到这两架飞机互相靠得太近。