[电] radio inertial-guidance system
wú xiàn diàn guàn xìng zhǐ dǎo xì tǒng ㄨˊ ㄒㄧㄢˋ ㄉㄧㄢˋ ㄍㄨㄢˋ ㄒㄧㄥˋ ㄓˇ ㄉㄠˇ ㄒㄧˋ ㄊㄨㄥˇ