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| 81. | All the alkali metals have a single s-electron outside a closed shell. |
| 所有的碱金属都在闭合壳层之外有一单个S电子。 |
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| 82. | single-stage single element ejector |
| 单级单联喷射器 |
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| 83. | single-phase single-speed motor |
| 单相单速电动机 |
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| 84. | Today high-speed presses can print many thousands of sheets in a single hour. |
| 今天，高速印刷机可以在一小时内印刷好几千张印品。 |
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| 85. | single-pole single throw switch |
| 单极单投开关 |
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| 86. | A reduplicated N-Mw phrase consisting of the numeral 一 and a measure word used as attribute indicates |
| 数词"一"和量词构成的数量词组重叠后作定语，表示事物很多或者强调个体。 |
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| 87. | single polarization single-mode fiber |
| 单偏振单模光纤 |
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| 88. | These back-to-back『一个接一个的；连续的』 appointments are giving me a heart attack/ killing me/ affecting my health |
| (这一连串的约会使得我疲于奔命。 |
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| 89. | single push and single loose |
| 单推单溜 |
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| 90. | Life is valuable and I'm going to treasure every single day," he said. |
| 生命很宝贵，我一定会珍惜我生命中的每一天，”他说。 |
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