Here, the convenient three-dimensional transportation networks, such as the fast tracks, subways and inter-city railways, become the best condition for commodity distribution.

这里快速通道、地铁、城际铁路等四通八达的立体交通网络成为商品集散的最佳条件。

Daddy got me one and we used to play with it together, but nothing could compare to Mr. Neds large intricate tracks and beautiful fast trains.

老爸为我买了一个，我们常在一起玩，但是什么模型也无法和奈德先生家那大型复杂的铁路和漂亮快速的火车模型相比。

This technique uses a computer program that tracks and calculates how fast particles move, and is accurate to plus or minus 20 per cent, reports NPR.

这项技术使用电脑程序来追踪和计算粒子移动的快慢，然后每一分精确的加上或者减去20，得出NPR。

When moving at a fast trot, a properly built dog single tracks.

当他快速奔跑时，结构正确的狗会趋向于单一轨迹。

The motor is a bit too fast, but it works and tracks the sun.

电机是有点太快了，但它的工作原理，并跟踪太阳。