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学生说明
Watch the 
on push and pull forces.
Click 
to complete the activity.
Click the 
to match the words PUSH or PULL to the right pictures.
Click 
to add to your journal.
教师备注（学生不可见）
Pushing and Pulling: What is the Difference? | Force and Energy for Kids | Kids Academy: https://www.youtube.com/watch?v=mEg5GOVpUlE
