| 1 | This book gave me a deeper understanding of history. | |
| 2 | We need a deeper understanding of the essence of this problem. | |
| 3 | We need to carry out more in-depth research on this issue. | |
| 4 | We need to have a deeper understanding of how genes affect inheritance. | |
| 5 | This issue leads us to think about deeper issues. |
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