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| 31. | to and fro; Back and forth |
| 来回地;前后 |
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| 32. | period return ticket |
| 限期来回车票 |
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| 33. | backwards and forwards |
| 来回地 |
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| 34. | return shipping cost |
| 来回输送成本 |
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| 35. | move about, move back and forth. |
| 走来走去，来回移动。 |
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| 36. | a round trip |
| 来回的旅行 |
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| 37. | advance return ticket |
| 预购来回车票 |
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| 38. | round trip time |
| 来回一次时间 |
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| 39. | standard return sea passage |
| 标准来回船费 |
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| 40. | It was 20 miles there and back. |
| 来回一共20英里。 |
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