跟车时间百分比（延误率）是衡量双车道公路服务水平的一个重要指标。

Percent Time-Spent-Following (Percent Time Delay) is an important index to estimate Level-of-Service of tow-lane highways.

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据欧洲航空业协会(Association of European Airlines)透露，去年，泛欧航班连续第四年航班延误率上升。

Last year was the fourth straight year that delays increased on intra-European flights, according to the Association of European Airlines.

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有时候软件的安装要花上数月的时间，有时候维护成本甚至超过了原始产品的价格。有时意想不到的延误和宕机会导致生产率出现明显下降。

Installations of software tend to take months, maintenance costs more than the original product price, and unexpected delays and down time result in a massive drop in productivity.

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