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| How to Lift a Heavy Object? | |
| 作者姓名： | 丁凤丽 |
| 摘 要： | Many people hurt their backs when they try to lift heavy things from the floor. It is easy to hurt your back muscles when you pick up a heavy object. However, there is a correct way to lift things from the floor. If you pick up big or heavy objects correctly, you probably will not hurt your back. |
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