例如，据官方估计，实行独生子女政策，每年减排18.3亿吨。
The one-child policy, for example, saves 1.83 billion tons of carbon dioxide emissions a year according to official estimates.
据官方估计，石油泄露和蔓延的速度达到每天6万桶，远远超过BP做出的估计，相当于每四天就达到一次埃克森-瓦尔迪兹号的泄漏量。
The authorities reckon that the oil may be flowing at a rate of 60, 000 barrels a day—far more than the company estimated, and the equivalent of an Exxon Valdez every four days.
据非官方估计，在过去的十年间，首都一套公寓的平均价格已经上涨了五至十倍。
By unofficial estimates, the average price of a flat in the capital has risen between five and ten-fold in the past decade.
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