More than 400 units in operation.

有400多台发电机组在运行。

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Among the coarse pulverized coal separators of generating units in operation, most of them are radial baffle type separator, with low separation efficiency and high resistance.

现在役机组中的粗粉分离器形式大多为径向挡板型粗粉分离器，分离效率低，阻力大。

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These units played a key functional role in the military operation.

这些单位在军事行动中起到了主要的职能作用。

《牛津词典》

The TSA says there are 247 Advanced Imaging Technology units in operation at 39 commercial airports around the country.

CNN: SHARE THIS

We are trying to fix the police, but while we're trying to fix the local conventional police, we have, in the same area of operation, national police units, we have Iraqi Army units, we have MOI Intelligence units, all kinds of different national assets and provincial assets operating in the same area with virtually the same jurisdictional boundaries.

NPR: Iraqi Police Struggle with Rule of Law

Glenelg, Kintail and Royal Air Force mountain rescue teams were involved in the operation, alongside the coastguard and police dog units.

BBC: Clive Dennier