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你无法拣起前面的钞票！ 试一试 靠墙站好,脚后跟靠墙,双脚并 拢。在脚前大约30厘米的地上放一 张钞票。现在……脚不移动,也不能 弯膝盖,你试一试,能拣起这张钞票 吗?
You cannot pick up the front banknote! Try standing against the wall, with the heel against the wall and your feet together. Put a banknote about 30 centimeters in front of your feet. Now...the foot does not move, nor can you bend your knees. Can you try this and pick up this banknote?