Air conditioning in the use of a period of time, screen pack, evaporator and air supply systems will build up large dust, dirt, producing a large amount of bacteria, virus.

空调在使用一段时间后，过滤网、蒸发器和送风系统上会积聚大量灰尘、污垢，产生大量的细菌、病毒。

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And also given some suggestion on swimming pool design about circulating period, setting time of water supply and discharge, disinfection of water in pool, design of inlet outlet and overflow slot.

同时对游泳池设计中循环周期、充放水时间的设定、池水的消毒、进出水口、溢水沟的设计等提出建议。

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We study the supply of and the demand for labors during 2005 to 2010 in Shanghai and predict the number of migrant labors required during the same period of time.

本文系统地研究了2005年到2010年间上海劳动力的供求趋势，测算了所需的外来劳动力数量。

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When a baby's head is stuck in the birth canal for an extended period of time, it cuts off the blood supply to the woman's surrounding organs.

VOA: special.2010.08.09

In fact, a battery system can perform more than a dozen tasks, from sending short bursts of power to stabilize the electric grid to releasing a steady supply of electricity over a longer period of time when there is a lot of demand for power.

FORBES: Energy Storage: It's All About The Software

If the customer exceeds a predetermined rate of transactions, purchases an expensive item, or if Bling Nation notices a lot of geographic variability over a short period of time, when a consumer taps a BlingTag, she could be asked to supply a PIN.

FORBES: Mobile payment is finally here (maybe)

To understand how ultra-easy money for a prolonged period of time misguides animal spirits, we define and distinguish two forms, demand-side entrepreneurship and supply-side entrepreneurship.

FORBES: How to Create Jobs: Stop Misguiding the Animal Spirits of Entrepreneurs!