manyknowledge可數(shù)嗎

　　From them, I learn many knowledge about foreign culture.

　　從他們身上，我學到很多關于外國文化的知識。

　　From them I learn many knowledge about foreign cultures.

　　從他們身上我學到很多關于外國文化的知識。

　　I am very like this activity very much. Because this activity can teach me many knowledge.

　　我非常喜歡這次活動，因為我能學到很多知識。