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| 61. | Americans seem either totally hurried and hard working or totally informal and at ease. |
| 美国人似乎不是匆匆忙忙埋头苦干，就是悠闲自得无所事事。 |
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| 62. | Those who immerse themselves in scientific research and work at it doggedly should be encouraged. |
| 有的人一头钻到科研里面埋头苦干，应当鼓励。 |
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| 63. | SHe is an industrious person; she put her back into whatever she do. |
| 她是个勤奋的人,不管做什么都埋头苦干。 |
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| 64. | plug valve |
| 旋塞阀 |
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| 65. | gravel retainer plug |
| 砾石承托塞 |
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| 66. | She is an industrious person; she put her back into whatever she does. |
| "她是个勤奋的人,不管做什么都埋头苦干。" |
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| 67. | retrievable plug |
| 可收回堵塞器 |
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| 68. | head slotted plug |
| 顶端带槽螺塞 |
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| 69. | She is an industrious person; she puts her back into whatever she does . |
| 她是个勤奋的人,不管做什么都埋头苦干。 |
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| 70. | electric sparking plug |
| 电火花塞 |
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