短語(yǔ)詞組短語(yǔ)severely degraded GPS signal GPS 弱信號(hào)degraded service signal 降級(jí)服務(wù)信號(hào)Degraded signal defect 劣化信號(hào)缺陷Signal Degraded 信號(hào)劣化trail signal degraded 路徑信號(hào)劣化 返回 degraded signal