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Welcome to our class !,Lecturer ：陈丹,hamburger,sandwich,bread,First , we need：,egg,ham,tomato,tomato sauce,lettuce,Lets make a sandwich.,First , apply（涂） some tomato sauce on a slice of the bread.,Next ,put the lettuce and the egg on the bread .,Finally, put another slice of bread on the top.,Finally（最后）, put another（另外的） slice of bread on the top.,Lets taste the sandwich!,
