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Plants help to purify the air.

We should probably purify this river water before we drink it.

Everything is clear.

There were assassination theories but it was not clear who would have killed him and for what reason. Even now the truth about his death is unclear.

The Koran, far from being inimitable, is a literary work of inferior quality, as it is neither clear, nor understandable, nor does it possess any practical value and is certainly not a revealed book.

Where a painting's general sense seems clear, moreover, the exact decoding of its content remains in doubt.

Frequently clear and balmy weather deteriorates and it soon rains cats and dogs.

At this stage there is still not a clear energy policy for bringing decentralised power to rural areas.

I hope to make clear why I think Emmet's theory, originally introduced in the field of design architecture, is so important in physics.

But there had been no indications Gorbachev was having any sort of health problems, and it is not exactly clear what's happened to him now.

'Fox's wedding'. "Er ...?" "Today, with an 81 percent likelihood, it will be clear skies but, depending on location, there will be sun showers."

I am aware that some question or justify the events of 9/11. But let us be clear: al Qaeda killed nearly 3,000 people on that day.

Be sure to clear the lint trap before you run the dryer. Otherwise, you might start a fire.

Solar energy seems to offer more hope than any other source of energy, particularly because those areas most in need of water lie rather close to the equator and have a relatively clear atmosphere.

We can say that there's not a clear winner in terms of a policy to curtail medical expenses and benefits.

Hey, steer clear of the boss today, he seems really ticked off about something.

It's not clear right now whether time travel is really something that exists in reality but its possibility has been proven by theoretical physics.

Cleanse me! Release me! Set me free!

That red cloth is a "fukusa"; it is a vital tool used to cleanse the tea equipment.

I purge my in-box every morning.

A former member of Poland’s anti-communist opposition movement and deputy defence minister, Macierewicz is known for his efforts to purge the country’s military intelligence services of communist and Russian influence.

The purge of ​alleged Communists and progressives had ​started as early as ​April.

No such purge had been seen in over a century.

One student says the purge is still going on in China and terror is widespread.