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51. | There is no cause for concern. |
| 不必发愁. |
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52. | Do not mention it . |
| 不必谢。 |
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53. | Don't bother to knock. |
| 不必敲门。 |
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54. | need no repetition |
| 不必重复 |
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55. | without comment |
| 不必多说 |
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56. | You are welcome |
| 不必客气。 |
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57. | That isn't necessary. |
| 这倒不必。 |
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58. | Don't worry(calm down,slow down). |
| 不必紧张 |
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59. | leave/let well alone :let alone without considering |
| 不必考虑 |
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60. | needless to say; of course |
| 不必说 |
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