Then the scientists threaded the rope so that it would take two elephants, pulling both ends at the same time, to move the table. If one yanked an end without its helpmate doing so, no reward.

之后，科学家们穿开绳子，这样就需要两头大象同时拉绳子的末端来移动桌子，如果猛拉其中一端而帮友没有这么做，将不能获得食物。

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A church bell usually resides in a steeple and the exercise involved has to do with repeatedly pulling on a rope.

教堂的钟通常放在一个尖顶中，需要做的劳动就是要重复不停的拉绳子。

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To investigate the motivations of both species, the researchers chose a task that both groups would willingly undertake: pulling a rope to get a food reward.

为了研究两种物种的动机，研究者挑选了双方都乐于接受的任务：拉绳奖食物。

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"They act like Lebanon is a rope and each is pulling the rope towards himself - and Lebanon is in the middle, " she adds.

BBC: Lebanese sceptical over unity talks