A rough approximation would be the dual spirals in pinwheel.

大致近似于纸风车上的双重螺旋线。

All the time the dual working of my mind distracted me almost to the point of insanity.

我脑中那种有双重存在在活动的感觉一直折磨着我，几乎使我神经错乱。

The road was already dualled.

那条路已改成了双车道。

※Youth is the season of hope, enterprise, and energy, to a nation as well as an individual. 青年时期对国家和个人都是希望、创业和精力充沛的时期。
※The administration of the law can never go lax where every individual sees to it that it grows not  lax in his own case, or in cases which fall under his eyes.Mark Twain, Arerican writer——在个人自己的案件中或是他所看到的案件中不能有疏忽，因此执法从来不能疏忽。美国作家  马克·吐温

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