preposition在…上;(与交通工具和出行方式连用);通过,使用;在(某时);在…时候,一…就;关于
adverb穿着,戴着;登上(公共汽车、火车等);在运行,使用中;(表示持续);发生;不停地,持续地
prepositionused for showing where something is
prepositionused with ways of travelling and types of travel
prepositionusing something
prepositionused for showing when
prepositionwhen something happens
prepositionabout
adverbcovering something
adverbin or into a bus, train, etc.
adverbworking; being used
adverbused for showing that somebody or something continues
adverbhappening
adverbwithout stopping