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41. | a lifetime subscription |
| 长期订阅. |
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42. | secular variable |
| 长期变星 |
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43. | secular acceleration |
| 长期加速 |
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44. | [colloq] lifetime meal ticket |
| 长期饭票 |
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45. | secular parallax |
| 长期视差 |
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46. | a long-standing arrangement |
| 长期安排. |
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47. | secular movement |
| 长期运动 |
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48. | extended high rate |
| 长期高产 |
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49. | extended sick leave |
| 长期病假 |
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50. | chronic anxiety |
| 长期焦虑 |
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