B - 2无法通过红外线、声音、电磁波、视觉上的及雷达信号跟踪侦查。

The B-2 is hard to detect via infrared, acoustic, electromagnetic, visual or radar signals.

youdao

B - 2无法通过红外线、声音、电磁波、视觉上的及雷达信号跟踪侦查。

The B-2 is hard to detect via infrared, acoustic, electromagnetic, visual or radar signals.

youdao