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| 21. | Unfortunately, it does not. |
| 很可惜，我们无从知晓。 |
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| 22. | wrest from Nature her secrets |
| 探索自然界的奥秘 |
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| 23. | It was impossible to penetrate the mystery. |
| 那奥秘无法揭穿. |
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| 24. | You never know till you have tried. |
| 不尝试，不知晓 |
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| 25. | You just can't tell." |
| 你根本无从知晓。 |
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| 26. | The Wonder of Chinese Bronzes |
| 中国青铜器的奥秘 |
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| 27. | made known; especially made widely known. |
| 使之被知晓；特别是使之广泛的被知晓。 |
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| 28. | Silkworm's Secret Unraveled |
| 揭开蚕丝的奥秘 |
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| 29. | incomprehensible mysteries. |
| 无法知晓的秘密 |
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| 30. | It's an insoluble mystery. |
| 那是无法解释的奥秘。 |
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