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| 51. | metal-metal tap |
| 金属－金属抽头 |
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| 52. | She was young and vivacious. |
| 她年轻又活泼。 |
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| 53. | an active toddler; active as a gazelle; an active man is a man of action. |
| 一个活泼的学走路的孩子；活泼得像头瞪羚；一个活泼的人就是个起作用的人。 |
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| 54. | she was wonderfully alive for her age; a face alive with mischief. |
| 对于她的年龄而言，她惊人的活泼；淘气、活泼的脸。 |
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| 55. | Nitrogen is inert except when heated to very high temperatures, where it combines with some of the more active metals, such as lithium and magnesium, to form nitrides. |
| 一般情况下，氮是不活泼的的。当加热到非常高的温度时它会同更加活泼的金属，如锂和镁反应生成氮化物。 |
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| 56. | In a lively or vivacious manner.Used chiefly as a direction. |
| 活泼的（地）用生动或活泼的方式。主要用于指挥 |
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| 57. | Polypropylene is chemically inert and compatible with all window frame materials. |
| 聚丙稀是一中不活泼的化学原料，所以能和所有的金属窗框架很好的配合在一起。 |
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| 58. | metal-to-metal seal |
| 金属-金属密封圈 |
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| 59. | Zinc is a chemically active metal, but its corrosion products are generally dense and adherent. These two facts explains the value of this metal. |
| 锌是一种化学性质活泼的金属，但它的腐蚀生成物一般有高的密度和附着力。这两点特性说明了这一金属的价值。 |
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| 60. | The style designed By this dress designer is Bright as well as dignified. |
| 这位服装设计师设计的款式，活泼中有端庄，端庄中显活泼。 |
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