如果你要修理轮子，只拧下那4个螺母就行了。
If you want to repair the wheels you just undo the four nuts.
它停在弯曲的轮子上，由于要爬上那平缓的斜坡到营地，累得喘不过气来，我带着几分担心，把自己和行李托付给它。
It stood there on buckled wheels, wheezing and gasping with exhaustion from having to climb up the gentle slope to the camp, and I consigned myself and my loads to it with some fear.
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