7. He is the big cheese. 他是个重要人物。
8. Well, I have other fish to fry. 好吧，我还有别的事要干。
9. He is just sour grapes. 他只是吃不到葡萄说葡萄酸。
10. The young man knows his onions. 这个小伙子精明能干。
