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。
2
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。
3
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.