单词	back-scratching
释义	back-scratching noun back-scratch·​ing ˈbak-ˌskra-chiŋ  : the reciprocal exchange of favors, services, assistance, or praise Word History First Known Use 1882, in the meaning defined above
随便看	perigee perigees periglacial perigloea periglottis perigon perigonal perigone perigones perigonia perigonial perigonium perigoniums perigons Perigordian perigynia perigynial perigynies perigynium perigynous perigyny perihelia perihelial perihelion perihelions

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