The danger posed by MANPADS is particularly great because of their unique qualities: not only are they small, cheap and easy to operate, but they enjoy freedom of location, time, target and scale of operation.
由于其独特性——不仅体积小、价廉以及容易操作，而且还享有位置、时间、目标和行动范围的自由——单人携带防空系统所造成的危险特别大。