当我们迈一步时，我们体内的两百块肌肉是如何协同工作的？
骡子和马一样有强壮的肌肉，但它们吃得更少，工作时间更长，而且像驴一样温和。
Mules have strong muscles like horses but they eat less, can work longer, and are gentler like donkeys.
骡子有着像马一样健壮的肌肉，但是吃的更少，工作时间更长，并且更温顺，像驴一样。
Mules have strong muscles like horses, but they eat less, can work longer, and are gentler, like donkeys.
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