They featured a sturdy but lightweight, tubular steel frame pneumatic tires and front wheel drive.

它们采用坚固而轻质的管状钢架充气轮胎和前轮驱动。

Things got even worse when, in 1887, a Scottish inventor redeveloped the pneumatic tire, creating a massive international market for rubber.

1887 年，一位苏格兰发明家重新开发了充气轮胎，为橡胶创造了一个巨大的国际市场，情况变得更糟。

Without this engine to form the motive power and the pneumatic tire to give it four air cushions to run on, the automobile would never have progressed beyond the steam carriage stage.

如果没有这种发动机形成动力，没有充气轮胎为其提供四个气垫以供行驶，汽车将永远无法超越蒸汽车阶段。