Sales have quintupled over the past few years.
過去幾年中銷售量較原來的增加了四倍。
《牛津高階英漢雙解詞典》
The population of China quintupled.
中國的人口是原來的五倍.
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Closer to the poles , humans have quintupled the amount of material floating on the ocean surface.
接近地極處的海平面人類廢棄物的量達到了有五倍之多.
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