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.
动物试验已经有一段时间了，而我们的文明并没有终结，看起来该论证的一系列事件并没有发生。
Since animal experimentation has been legal for some time and civilization has not yet ended, it seems particularly clear that this chain of events won't necessarily take place.
观测研究常常会误导。一旦随机临床试验最终结束，也许结果巧克力根本不会产生很多心脏的益处。
Observational studies are often misleading. Once randomized clinical trials are finally completed, it may turn out that chocolate does not actually produce much of a cardiac benefit after all.
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