rapid

1. (usually plural)A rough section of a river or stream which is difficult to navigate due to the swift and turbulent motion of the water.

   Stromschnelle

   стремни́наstremnína, поро́гporóg

   порогиporohy

2. (dated)A burst of rapid fire.

1. He has made rapid progress in English.

   Він швидко досяг прогресу в англійській. — Teashrock

   deEr hat schnell Fortschritte im Englischen gemacht. — Dejo

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2. There was a rapid decline in stock prices.

   deEs gab einen rapiden Fall der Aktienkurse. — al_ex_an_der

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3. There is a rapid increase in world population.

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4. They were surprised at the city's rapid growth.

   ruИх удивил быстрый рост города. — kadavraverkisto

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5. The development of the computer industry has been very rapid.

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regular