The Charts 2-3 and 2-4 below separately explained the existing distribution of Xi'an municipal comprehensive traffic network and that of the external road communication.

西安市对外交通综合运输网络布局现状及对外交通公路布局现状分别见图2-3、图2-4。

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Only months or years down the road (depending on growth rate) will they plan for a migration to external disks, and usually tapes will only be in place after numerous years.

而仅仅几个月或几年之后（取决于增长速率），他们就会开始规划移植到外部磁盘，而磁带通常要在几年以后才会参与进来。

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Despite this high growth rate, Laos remains a country with a primitive infrastructure; it has no railroads, a rudimentary road system, and limited external and internal telecommunications.

尽管经济增长率很高，老挝仍是一个基础建设相当原始的国家，没有铁路，只有一个落后的公路系统和十分有限的国内外电子通讯。

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Road-pricing has long been championed by economists, keen to impose more of the external costs of driving on road-users by charging them a fee that reflects not just the distance travelled (which is loosely what gasoline taxes do) but also the time and route of the journey.

ECONOMIST: Road-pricing in California

An experimental section of road where an external computer can take over your car if you wish (and are suitably wired up) is now open in California to test the idea.

ECONOMIST: Traffic management

Property damage claims were analyzed over a two-year period (from January 2009 to December 2010) to ensure the findings would not be impacted by external influences such as weather or road construction.

FORBES: Cities With The Worst Drivers 2012