研究者通过对数据采集服务选取的对象进行了三个在线试验。
The authors conducted three online experiments with participants recruited from a data-collection service.
经过十多年伟大的在线试验，免费与付费之间的对决正步入终结。
A decade and a half into the great online experiment, the last debates over free versus pay online are ending.
伦托说，农村学校也许是试验像在线课程等数字化教学的最佳地点，因为农村学校已经难于提供一些类型的课程。
Rural schools are perhaps the best place to experiment with digital teaching methods like online courses, since they have trouble offering some types of classes already, said Ms. Lento.
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