Different versions of the MI-17 helicopter are designed specifically for high-altitude military operations and are in service in the mountains of Afghanistan.

MI - 17直升机的不同版本专门为高海拔军事作战而设计，并在阿富汗的山区服役。

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In some instances, this effort is extended to include sending messages through to backend service provider applications to ensure that both frontside and backside links are in service.

有些情况下，还会将消息发送给后台服务提供者应用程序，以确保前台和后台连接都能够正常使用。

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As a result, businesses are much more accountable, often in very specific ways, which creates powerful incentives to improve service.

其结果是，企业往往以非常具体的方式变得更加可靠，这就产生了改善服务的强大内在动力。

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The two biggest employers in the area are government and the hotel and food service industry.

VOA: special.2009.03.30

What if every synagogue and mosque, church, temple, secular humanist society was involved in congregational exchanges the way that most of these institutions are now involved in some kind of service work?

如果每座犹太教会堂，穆斯林清真寺，基督教堂，佛教寺庙，世俗社会都参与到,公众的交流中，将会怎么样？,大多数机构正在以这种方式,参与某种服务工作中？

普林斯顿公开课 - 人性课程节选

Typically, the youngest guys are twenty, and typically the oldest guys are 45, but everybody was liable to military service in these states until they were about 60.

一般来说,最年轻的二十岁,最年长的四十五岁,但是在有些城邦中,六十岁以下的人都能参军

耶鲁公开课 - 古希腊历史简介课程节选

According to the Air Force, 33 U-2s are in service today.

WSJ: Cold War U-2 Pilot Francis Gary Powers to Receive Silver Star

Some 4, 500 fixed lines are in service.

CNN: BUSY SIGNALS

On the more modern coal plants like fluidized bed type plants that are already in service, there are several alternatives.

FORBES: Moving Beyond The Symbolism Of Earth Hour