Between 1981 and 1997, detailed time-use studies showed that the time children spent atplay declined by 25 percent.
从1981年到1997年，详尽的时间使用研究表明，孩子们花在玩耍上的时间减少了25%。
2
Only those species with ways of spreading to these islands were able to undertake the long journeys, and the various factors atplay resulted in diverse combinations of new colonists on the islands.