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| 51. | Non-renewable energy resources |
| 不可再生能源 |
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| 52. | irreducible set |
| 不可约集 |
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| 53. | Not To Be Packed Under Heavy Cargo |
| 不可重压 |
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| 54. | " do not drop " ; " not to be drop " . |
| 不可掉落 |
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| 55. | non-contactable region |
| 不可接触区 |
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| 56. | unconquerable; invincible |
| 不可战胜 |
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| 57. | irreversible reactio |
| 不可逆反应 |
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| 58. | unforgivable; unpardonable |
| 不可原谅 |
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| 59. | beyond understanding |
| 不可理解 |
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| 60. | " not to is lay flat " ; " never lie flat ". |
| 不可平放。 |
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