Stressfractures, or tiny cracks in the surface of a bone, are serious running injuries that requires immediate treatment.
应力性骨折,或者在骨头表面上的微小裂缝,是严重的跑步受伤,并且需要立即治疗。
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In animals biological limits are already clear: turkeys are so bloated that they can no longer walk; chickens grow so quickly that they suffer stressfractures.