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| 1. | Research into the distribution, nature and causes of landslides on natural terrain is continuing. |
| 有关在天然山坡发生的山泥倾泻的分布、性质及起因研究仍在进行。 |
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| 2. | natural terrain obstacles |
| 天然障碍物 |
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| 3. | natural sloping terrain |
| 天然斜坡；天然倾斜地形 |
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| 4. | Hong Kong's natural terrain is dominated by mountains and hills with steep slopes, many of which descend |
| 香港的天然地形主要由陡峭的山坡及山脉构成，其中许多山脉直伸海中，而海床较为平坦。 |
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