道路一般是由两个相反方向的行车道构成，称为双向车道。（行车道是指供各种车辆纵向排列、安全顺适地行驶的公路带状部分） 其中包括双向四车道，双向六车道，双向八车道最为普遍。
婚姻关系只有行驶在充分给予和获得的双向车道上才能成功。
Relationships work ONLY when they are two-way streets, with much give and take.
一旦到达WMDR，道路宽度很快会变窄为一个3米宽的双向车道泥土路。
Once on the WMDR it quickly narrows to a 3-meter wide dirt road with two-way traffic .
在城市的外围，繁忙的双向车道边，有一片由低层、园林风格的建筑物组成的地方，便是剑桥科技园了。
But on the outskirts of the city, just off a busy dual carriageway, is the collection of low-rise, landscape-gardened buildings that make up the Cambridge Science Park.
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