An invigilator is a frequent medical device which has characters of much in quantity, wide in distribution.

监护仪是一种最常见的医疗设备，具有数量多、分布广等特点。

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Meanwhile, fine crystal discharge device was added in crystallizer to decline quantity of crystal nucleus and to increase crystal growth rate so as to reach the aim of improving crystalline quality.

同时在结晶器中增加细晶排出装置，降低晶核数量，提高晶体生长速率，达到改善结晶质量的目的。

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The key device is the oil pump, computer control to the quantity of core is oil pumps, computer control the pulse type oil pump and the full combustion goodly.

取暖器中的关键装置是燃烧器中的油泵，单片机对油泵控制的质量是燃烧器控制的核心。

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Windows Phone 7 is a known quantity and requires a much lower specification of device to run.

FORBES: What's The Story Behind Windows Phone 7.8?

The quantity of processing power or storage capacity you get per device and per dollar still doubles every few years.

FORBES: Magazine Article