中国影视盗版的看法剧情介绍:stain /ste?n/ n. 污迹,污点;瑕疵擦掉黑板上的字 rub words off the blackboardA:Who rubbed my words off the blackboard?谁把我写在黑板上的字擦掉了?B:I did it. It's my duty today. Anything wrong?我擦的。今天我值日。有什么问题吗?duty /?dju?ti/ n. 责任;义务;职责;税用水清洗黑板 wash the blackboard with waterA...