I do not know whether you realize it, but this condition is essential to us.
我不知道你是否了解,但是,这个条件对我们是必要的。
riding on its air cushion over a single rail, which it never touches,at speeds up to 300 m.p.h.----the possibilities appear unlimited.
靠气垫在单轨上行驶而不接触轨道,时速可达每小时300英里。气垫船的前途是不可限量的。