自从我们的双胞胎开始学走路以来，我和妻子一直告诉他们，我们家的滑动玻璃门只是一扇窗户。
Since our twins began learning to walk, my wife and I have kept telling them that our sliding glass door is just a window.
猿猴的肩膀有利于其在吊在树上，但是当我们的祖先开始以两条腿走路以后，猿猴的肩膀也开始发生变化。
The ape shoulder is good for hanging from a tree, but when our ancestors started walking on two legs, the shoulder started to change.
我们可不可以走路开始？
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