Although some experts estimate that China 's economy will become the world's largest as early as 2030.

尽管一些专家估计，中国经济将成为世界上最大的2030年早。

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This means hundreds of thousands of students hold internships each year; some experts estimate that one-fourth to one-half are unpaid.

这意味着每年有数十万大学毕业生加入实习队伍，一些专家估计其中有四分之一到一半是没有报酬的。

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The size of the cyber crime estimate has surprised some experts.

对网络犯罪规模的估计使一些专家大吃一惊。

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While reliable data are scant, of the estimated 225, 000 reports each year of people collapsing of sudden cardiac arrest, some experts estimate AEDs are generally used to help fewer than 5% of victims.

WSJ: This Device Saves Lives, But Can Be Hard to Find

Some experts estimate that there are four billion devices connected to the internet but, according to researchers at the Stanford School of Medicine, a typical healthy human brain contains about 200 billion nerve cells, or neurons, linked to one another via hundreds of trillions of tiny contacts called synapses, that function like microprocessors.

FORBES: Information Overload and the Power of the Human Brain