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61. | Above all, you must collect the necessary materials. |
| 首先,你必须把必要的资料搜集起来。 |
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62. | It is necessary to maintain surveillance on these meters. |
| 必须对这些仪表保持经常性的监测。 |
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63. | It is necessary to exterminate the post at the sawmill. |
| 必须端掉锯木厂边的哨所。 |
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64. | Is it necessary for you to go there every night? |
| 你必须每天晚上都到那里去吗? |
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65. | When the weather changes, it becomes necessary to change one's clothing. |
| 气候变化了,衣服必须随着变化。 |
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66. | It is necessary that every memBer inform himself of these rules. |
| 每个成员必须了解这些规则。 |
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67. | Such moving away is both permissible and necessary. |
| 这样的走是许可的,是必须的。 |
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68. | For proper combustion it is necessary to atomize the propellants. |
| 为了有效地进行燃烧,推进剂必须雾化。 |
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69. | We must bestir ourselves to take the necessary action. |
| 我们必须积极(奋力)采取必要的行动。 |
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70. | Potassium is necessary to the existence of all living things. |
| 钾是所有生物生存必须的。 |
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