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学生说明
Use the 
feature to answer the question.
What changes can you make so that your design is even better?
教师备注（学生不可见）
This is step 8 in the engineering process - look for the other activities 1. Goal 2. Materials 3. Working together 4. Plan 5. Create 6. Evaluate 7. Test 8. Improve 9. Looking Back page 1 10. Looking Back page 2
