| 41. | Fighting is natural to dogs. |
| 狗天生喜欢打架。
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| 42. | come natural to sb. |
| 对某人来说是轻而易举的；对某人来说是天生的。
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| 43. | Speaking comes natural to him. |
| 他天生善于演说。
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| 44. | We must strive for the preservation of our natural resources. |
| 我们必须努力保护我国的自然资源。
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| 45. | The company exploits natural resources to its own profit. |
| 这家公司为了自身利益而开发自然资源。
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| 46. | Most natural rubber must be purchased from British and Dutch combines. |
| 大部分天然橡胶必须从英国和荷兰的联合企业购进。
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| 47. | Birds are catalogued under natural history. |
| 鸟类在博物学中有其分类。
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| 48. | A small child's confusion in distinguishing between " left " and " right " is quite natural . |
| 小孩子分不清左右是很正常的。
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| 49. | This was the natural course to pursue. |
| 这是应该走的必由之路。
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| 50. | He died a natural death six years ago. |
| 他在6年前寿终正寝。
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