[计] ballistic missile defence system
dàn dào dǎo dàn fáng xiè xì tǒng ㄉㄢˋ ㄉㄠˋ ㄉㄠˇ ㄉㄢˋ ㄈㄤˊ ㄒㄧㄝˋ ㄒㄧˋ ㄊㄨㄥˇ
弹道导弹防卸系统