英语笑话：That's what I've been doing

　　A mother was talking to her little boy. "Now, Billy, you shouldn't be selfish with your toys. I've told you to let your younger brother play with them half the time."

　　一位母亲在和她的小男孩说话。“听着，比利，你对自己的玩具不应该自私。我已经对你说过要让弟弟玩一半时间。”

　　"That's what I've been doing, " said Billy. "I take the sled doing downhill, and he takes it going up."

　　“我一直都是这样做的，”比利说。“我把雪橇滑下坡，他再拿上来。”

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