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有这样一则故事:一位女士去一位美国老师家做客,她看见老师不满3岁的孩子正在将一把钥匙笨拙地插进锁中,孩子想要打开卧室的门,可是由于身高和协调性都不够,怎么也打不开。
There is a story like this: A lady visiting a US teacher’s house and she saw that a teacher under 3 years old was clumsily inserting a key into the lock. The child wanted to open the bedroom door, but due to height and coordination Sex is not enough, how can not open.