Some scientists estimate that at the present rate of use, the world's known oil deposits could ran out in from 10 to 15 years.

一些科学家估计，以现在的速度使用石油，全世界已探明的石油储量可能在10至15年内消耗。

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Now that bacteria-tracking methods have gotten better, scientists estimate that in some areas, 20 to 30 percent of the bacteria in a stream comes from dogs.

细菌源追踪技术的日臻完善，科学家估计，部分地区20%到30%的细菌是由狗狗造成的。

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Now that bacteria-tracking methods have gotten better, scientists estimate that in some areas, 20 to 30 percent of the bacteria in a stream comes from dogs.

细菌源追踪技术的日臻完善，科学家估计，部分地区20%到30%的细菌是由狗狗造成的。

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