同样可以尝试不同的绑鞋带方式来增加鞋子上部的包裹性，并锁紧鞋跟。
Also experiment with different lacing patterns to more securely wrap the top of the shoe and lock in the heel.
因为这些关节不是由肌肉包裹的，所以这些疼痛源于肌肉的可能性极小。
Because these joints are not covered by muscle, pain here is rarely of muscular origin.
研究者通过对包裹化石的沉积层进行放射性元素年代测定，推断出中华龙鸟生活在1.25亿年前。
It lived around 125 million years ago, based on the dating of radioactive elements in the sediments that encased the fossil.
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