The bird flew into the crystal clear window.

这只小鸟撞上了完全透明的窗户。

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The toy is a giant billiard ball filled with blue liquid and a clear window that looks in on a shape, which floats in the liquid, with 20 sides.

这种玩具是个巨大的撞球，里面装满了蓝色的液体，还有一个清楚的窗口，通过该窗口可以看到一个漂浮在液体中的20面体。

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As soon as the coast was clear he climbed in through the window.

等到四下无人，他便从窗户爬了进去。

《牛津词典》

"There is now a clear window of opportunity for President Karzai and his government to make a new compact with the people of Afghanistan The Obama administration and other Western leaders have repeatedly urged President Karzai to use his next five-year term to eliminate endemic corruption.

VOA: standard.2009.11.18

This new product, produced by the brokerage TD Ameritrade, tries to offer a clear window into the sentiments of 6 million retail investors at the brokerage.

FORBES: You Can't Win If You Don't Finish the Investing Race

The Mexican notes, for instance, have a clear security window that is difficult to forge.

ECONOMIST: The rising popularity of plastic payment, in all its forms

But there is still controversy about what causes them, and that will not be resolved until the gamma-ray window is clear again.

ECONOMIST: A new gamma-ray telescope has just been launched