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| 71. | The children were jumping about and full of life. |
| 孩子们来回跳动，充满了活力。 |
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| 72. | The pendulum swung slowly to and fro. |
| 钟摆在慢慢地来回摆动。 |
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| 73. | swim two lengths of the pool |
| 在游泳池中游一个来回 |
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| 74. | roll over and over, back and forth. |
| 来回地，反复地翻身。 |
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| 75. | tooled up and down the roads. |
| 在路上驾车来回行驶 |
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| 76. | The branches of the trees are swaying in the wind. |
| 树枝在风中来回晃悠。 |
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| 77. | cause to move around, turn a key. |
| 使来回移动，“旋转钥匙”。 |
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| 78. | travel back and forth between two points. |
| 在两点之间来回穿梭。 |
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| 79. | an acrobatic feat of rolling or turning end over end. |
| 杂技演员来回翻滚的动作。 |
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| 80. | go around the flank of (an opposing army). |
| 在敌军侧翼来回走动。 |
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