The Kowloon-Canton Railway started operation in 1910 and was double-tracked and electrified in the early 1980s.

九铁在一九一零年投入服务时是一个单轨系统，在一九八三年，已改善成为一个完全电气化的双轨铁路系统。

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Admittedly, this property is a confusing one because it reads like a double negative, but by default, all read and unread documents are tracked in a database.

大家都认为这条属性令人费解，因为它读起来像是一个双重否定句，但是在默认情况下，数据库中所有已读的和未读的文档都会被跟踪。

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Freddie's voice is double tracked and at the top of his range.

Freddie的声音在制作上运用了立体声录音（double tracked），且达到了他的最高音域。

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The double-digit year-over-year gain is the largest tracked by NAR since November 2005 when the median price jumped 13% year-over-year.

FORBES: Homes Sales Begin To Slip As Buyer Demand Outpaces Supply

The double hit prompted bank executives to look for new revenue ideas that could be fast-tracked because the outlook for the bank's consumer operations was so bleak, said one person familiar with the planning.

WSJ: Bank of America Weighs New Set of Fees