Mice were trained to push levers to get either of two rewards. Press one lever, out comes a drop of sugar water.
研究人员训练老鼠去推动控制杆，推动之后能得到两种报酬中的一种——推动第一个控制杆，就会渗出一滴糖水；
A heavy forge hammer having a pivoted lever by which it is tilted up and then allowed to drop.
锻造用的重锤，通过带枢轴的杠杆将它倾斜抬起，然后落下。
A heavy forge hammer having a pivoted lever by which it is tilted up and then allowed to drop.
锻造用的重锤，通过带枢轴的杠杆将它倾斜抬起，然后落下。
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