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| 71. | four track recording |
| 四声道录音 |
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| 72. | four-electrode pattern |
| 四极组合 |
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| 73. | Four Roses Whiskey |
| 四玫威士忌 |
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| 74. | four-axis system |
| 四轴系统 |
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| 75. | four stroke engine |
| 四行程发动机 |
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| 76. | four knights' game |
| 四马局 |
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| 77. | four fold block |
| 四饼滑车 |
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| 78. | four-effect evaporator |
| 四效蒸发器 |
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| 79. | four-address computer |
| 四地址计算机 |
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| 80. | four-electron ligand |
| 四电子配体 |
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