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| 51. | New knowledge about nature's living clocks has practical applications. For man,too,seems to follow daily rhythms. |
| 关于大自然的“活钟”的新知识具有实际用途。人类似乎也遵循每天的时间节奏。 |
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| 52. | Gross domestic product,real |
| 实际国内生产总值（实际GDP） |
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| 53. | actual expenses |
| 实际支出；实际费用 |
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| 54. | special-purpose clock |
| 特殊用途钟 |
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| 55. | actual practice |
| 实际实行，实际应用 |
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| 56. | To reserve or set aside for a particular purpose. |
| 指定用途指拨或留置一边以作特殊用途 |
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| 57. | incompatible land use |
| 不协调的土地用途；不相配的土地用途 |
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| 58. | a multiplicity of uses |
| 众多的用途 |
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| 59. | A person is not a utility; a thing is a utility. |
| 一个人不是一种用途；一件东西是一种用途。 |
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| 60. | general purpose cutter |
| 一般用途切割器 |
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