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| 41. | kept from public knowledge by various means;. |
| 用各种手段不让公众知晓。 |
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| 42. | Not just the lesson in a book or how the rivers flow; |
| 不只是书本知识或是自然奥秘， |
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| 43. | Science unlocks the secrets of nature. |
| 科学揭开大自然的奥秘。 |
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| 44. | make known or cause to appear with great speed. |
| 使知晓或使快速出现。 |
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| 45. | The secret is hard work. |
| 成功的奥秘就是努力工作。 |
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| 46. | make familiar or acquainted with. |
| 使熟悉或知晓某件事情。 |
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| 47. | unfathomablemotives, mysteries |
| 难以理解的动机、 奥秘. |
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| 48. | they were acquainted; fully acquainted with the facts. |
| 他们很熟；完全知晓这些事实。 |
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| 49. | The great system is very mystery. |
| 宇宙是很奥秘的。 |
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| 50. | not knowledgeable about something specified. |
| 对特定的事物不知晓。 |
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