声音简介
Sleeping Horses
When it's time to sleep, you go to bed and lie down. Soon, you fall asleep.
But not all animals are like that. Horses, for example, can stand while they sleep. Isn't that strange! How do they do that?
It's all in the horse's knees. A horse can lock it's knees so it does not fall down. Isn't that amazing?
Yes, horses can sleep standing up without falling over!
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