I often try to double-check a counter the first time I add it to a report.

我经常尝试仔细检查我第一次添加到报告的计数器。

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Data selector alternately to realize the functions of double edge trigger addition counter output the odd and even data in two counters.

数据选择器则将两个计数器中处于保持状态的奇偶数据交替输出，实现双边沿触发加法计数器的功能。

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Double Edge Trigger counter is composed of odd counter, even counter and data selector.

双边沿触发计数器由偶数、奇数加法计数器及数据选择器组成。

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As United held firm, with an ever-present menace on the counter-attack, Ancelotti made a double change with 20 minutes left, replacing Yuri Zhirkov and Drogba with Florent Malouda and Nicolas Anelka.

BBC: Chelsea 0-1 Man Utd

My own estimate is that there are about 10, 000 white hat security researchers working full time to counter malware (100 vendors X 50 average and double that for independents.) I am still working on an estimate of the number arrayed on the other side of this battle ground.

FORBES: Battleground Cyberspace: Hackers vs. White Hats

Although the housing market has stabilized over the last half a year, the chorus calling for a double dip in housing is growing louder as data such as this runs counter to a sustainable recovery thesis.

FORBES: Housing Starts Stumble After Stimulus