单词	Rollin film
释义	Rollin film noun Rol·​lin film ˈrälə̇n- : a very thin film produced by capillary creeping of liquid helium II over a solid surface Word History Etymology probably from the name Rollin
随便看	step up the pace step up to the plate step ups step ward step wedge step-and-repeat step-by-step step-by-step telegraph step-cline step-cone pulley step-down step-downs step-hop step-in step-off step-on step-ups stepbairns stepbrother stepbrothers stepchild stepchildren stepdad stepdads stepdame

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