float up浮起floatv.漂浮；浮现；飘动；提出n.浮标；漂浮物；漂浮float dollar sign浮动美元符号floating security浮动担保float line roller浮子绳滚筒floating constant[计] 浮点常数floating on water漂浮在水面上floating elevator水上升降机floating catheter浮动性导管float zone growth浮区生长floating downward下浮Floating point IP浮点IP