目前尚不清楚百度是否会放弃原先那种将付费广告与自动搜索结果放在一起的做法，百度也没有澄清其计划，仅仅表示系统测试刚刚开始。
It's not yet clear if the company will abandon its practice of putting paid ads among organic search results - and Baidu didn't clarify its plans-saying only that testing of the system just started.
早在1994年他们就发明了一套可以确定一个对大多数普通种类的鲸鱼可以忍受的捕杀数量的运算方法，尽管仍然不清楚它们的丰度怎样。
Back in 1994 they devised an algorithm to determine a sustainable catch of the most common whale species despite continuing uncertainty about how abundant they are.
据作者称，所观察到的疲劳度变化的背后机制目前仍不清楚。
According to the authors, the mechanisms that underlie the observed changes in fatigue are unclear.
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