为避免膝盖疼痛，你可以在柔软的地面上跑步，多加练习来加强腿部肌肉，尽量不在斜坡上跑，并买双好的跑鞋。

To avoid knee pain, you can run on soft surfaces, do exercises to strengthen your leg muscles, avoid hills and get good running shoes.

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“嗯，如果这算幼稚，”我翻着卡通书，随口说，“那我想我也是幼稚的，因为，要是我小时候那条柔软的旧婴儿毯不在我的枕头下，我就睡不着觉。”

“well, if it is, ” I say, crunching my carrot, “then I guess I’m immature, too, because I can’t fall asleep unless the tiny scrap of my old baby blanket is under my pillow.”

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这个概率和其他鸟类世界的相似，甚至包括了那些拥有柔软鸟巢和从不在鸟蛋附近争斗的鸟类。

That rate is similar to the rate in the rest of the bird world, even including those birds that have cushy nests and never fight near their eggs.

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