Although the exact size is unknown, the current estimate is that there are about 100 million hosts and over 350 million users actively on the Internet.

尽管其具体规模无法知晓，但现在估计有1亿台主机和超过3.5亿的用户活跃在因特网上。

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So the Fed seems to be resigned to hoping that keeping interest rates at current levels for a long period — 18 to 24 months is the current estimate — will do the job.

于是美联储似乎退而希望长期保持目前的利率——目前估计是18到24个月的样子——目标就能达到。

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Some analysts estimate that food production will need to be raised by 50 percent to maintain current levels.

一些分析人士预测，粮食产量需要提高50%才能维持目前的水平。

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The current estimate is that some 30% of workers find their choices so constrained.

FORBES: A Use For The Commerce Clause: Increasing US Labour Mobility Through Occupational Licensing

The company is set to ramp up production from its current estimate of 229, 000 motorcycles this year.

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By contrast, the current estimate of the number of protein-coding genes in the human genome is 23, 000.

ECONOMIST: Genomics has not yet delivered the drugs, but it will