Float switch can automatically control the start and stop of pump according to the variation of required liquid level, with no need of a special person to care about, making operation quite easy.

浮球开关可以根据所需液位变化，自动控制泵的起动与停止，不需专人看管，使用极为方便。

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The invention proposes an apparatus and method for implementing official telephone by a main control board, making operation and maintenance much more flexible and convenient.

本发明提出了一种主控板实现公务电话的装置和方法，使操作维护更加灵活便捷。

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Improvement to the old method formulated in this paper mainly lies in the combination of phase displacement method with frequency two-dimensional filtering in making operation.

本文对原方法的主要改进点是把相位移法与频率域二维滤波结合在一起进行运算。

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British commanders say this Operation is making good progress, but in Afghanistan as a whole it has been a tough month, and in Britain public opinion-polls indicate public support is falling.

VOA: standard.2010.08.04

The good news: With the equity market picking up, even Merrill's market-making operation showed gains in the first quarter.

FORBES: Billion-Dollar Blunders

The company now has just one loss-making cargo operation, in Chicago.

BBC: Menzies

They are making sure the operation does not fall apart, and are determined to pass control to Afghans as soon as possible.

BBC: Can the Afghan army take the lead in battle?