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81. | The cheerleaders are jumping to and fro. |
| 拉拉队长们来回地跳跃。 |
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82. | He puffed breath in and out. |
| 他来回地吸气吹气。 |
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83. | The figures have been oscillating about an average. |
| 数字围绕平均数来回波动。 |
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84. | To cause to move back and forth rapidly. |
| 摆动使来回迅速移动 |
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85. | Up and down the brooms walked. |
| 扫把们楼上楼下来回走着, |
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86. | The tennis Ball was hit Back and forth. |
| 网球被来回地击打。 |
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87. | make to-and-fro movements as if with a saw |
| 像拉锯一样来回移动 |
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88. | What is the fare to London and back? |
| 去伦敦来回要多少钱? |
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89. | Nobody can recall how many trips it made. |
| 不知来回跑了多少趟, |
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90. | Up and down the stairs it ran. |
| 它在楼梯上来回奔跑。 |
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