The method of instantaneous value comparison for source current control of unity power factor rectifier possesses advantages of simplicity as well as valid restriction for maximum switching frequency.

在单位功率因数整流器中，利用瞬时值比较法来控制电源电流，不但控制简单，还可有效限制器件的最高开关频率。

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Current efforts in malaria control are mainly based on the use of insecticide sprays and treated bed nets.

VOA: special.2009.12.22

The British Health Secretary Alan Milburn said the current system of control through licences needed to be strengthened by law "to ensure that genetic advances are used for good rather than for evil".

CNN: Britain to ban human cloning

He said the current sharing of a control room had proved the two services can work together.

BBC: Cambridgeshire and Suffolk fire service merger on hold

It is incredibly clear that the current policy of TB control is an abject failure, so carrying on as we are is doomed to increase the size of any effective future badger cull.

BBC: Viewpoints: The badger cull