... 带凸缘针 flanged pin 两端带螺纹的 both end threaded 两端带弯钢筋 bar hooked at both ends ...
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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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