translation.en: But the problem with this car was it was designed to only be driven in a very controlled environment, in a flat, closed-off parking lot -- even the lanes defined by red traffic cones.
translation.zh: 但是这车的问题在于 它的设计只能让盲人在很有限的环境下驾驶， 像一个封闭的停车场-- 甚至能在用红色交通锥搭成的小路上行驶。