You mustn't go walking about in corridors and listening.

不许在走廊里走来走去，不许听别人说话。

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One of the great things about walking outdoors is that you can use hills and steps to add some difficulty, thus burning more calories, and toning your muscles.

户外步行的一个难得好处就是，您可以利用户外的小山、台阶来给自己身体增加难度，从而燃烧更多的卡路里，并调节肌肉。

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Think about walking down a crowded street: You see a lot of faces, street signs, all kinds of stimuli.

想一想当你走在拥挤的街道上：你看到很多面孔，很多招牌，各种各样的信息刺激。

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But the best part, of course, is that while you're watching YouTube vids and walking about you'll avoid stumbling into objects and passersby.

ENGADGET: blogger-avatar

The best thing about walking is that you are your own boss: start and halt, look at everything or nothing, think about a lot or a little.

ECONOMIST: Walking

In extreme cases, you might think about muzzling the dog if you're out walking amongst other people.

NPR: The Ethicist: Weighing a Canine Conundrum