双程线的英文：
dual carriage way

dual是什么意思：
adj. 双的；双重的
n. 双数；双数词

His dual role as composer and conductor.
他兼作曲家及指挥的双重身分。

Dual-color fruit coffee
双色水果咖啡

Dual moisture detection probes to eliminate false alarms
双重防潮保护的探针能够避免警报失灵或误报

This dual tug is apparent in the whole movement of expatriation
这种两面周旋的态度在整个寄居海外运动中极为明显。

Dual to the bad weather, I did not test.
由于坏天气，我没有测得结果。

carriage是什么意思：
n. 四轮马车；火车的客车厢；运费；举止

The carriage rolled rapidly onward.
马车急速地行驶着。

The groom returned to the carriage.
马夫回到马车那儿。

bearing; a carriage; deportment; presence
仪态

The carriage left a trail of dust.
马车后扬起了一缕烟尘。

Please document the documents of carriage.
请附运输单据于汇票。