SINCE 1979 China has undertaken a bold demographic experiment to reduce its population growth, placing a limit on the number of children many couples can have: one.

从1979开始，为降低其人口的增长，中国实施了一场勇猛的人口实验，限制许多夫妻所能生育的数：一个。

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A field experiment was conducted to study effects of root pruning at returning green stage on population structure, soil water and yield formation of winter wheat.

通过田间试验研究了返青期不同程度根修剪处理对冬小麦群体结构、土壤水分及产量形成的影响。

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An experiment conducted in the southern state of Kerala found that a sudden fall in the bee population was caused by towers installed across the state by cellphone companies to increase their network.

在印度南部喀拉拉省进行的实验发现，当地蜜蜂数量突然减少，是行动电话公司为扩大网路在该省各地设立基地台造成的。

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In a unique economic experiment, 16 countries with a combined population of 329m have handed over monetary sovereignty to an entity at arm's length from national politics: the European Central Bank (ECB).

ECONOMIST: Holding together

The researchers conducted a third experiment online to test the effects in a more diverse population.

FORBES: Think Negative, Think Certain

Nanto City, a centrally located Japanese city with an elderly population that comprises 26% of its total residents, is one of the first municipalities in the world to experiment with using robots to help care for the elderly.

FORBES: Magazine Article