tom is helping daming _his english

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tomishelpingdaming_hisenglishtomishelpingdaming_hisenglishtomishelpingdaming_hisenglishstudy/tostudy

tom is helping daming _his english
tom is helping daming _his english

tom is helping daming _his english
study/ to study/with

类比 筑堤坝拦(水);在…筑堤坝(或水闸) 填up

study with