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1. | It is necessary for sB. to do sth. (It is necessary that ...) ... |
| 是必须的;必须... |
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2. | It's necessary to operate on him. |
| 必须给他做手术。 |
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3. | It is necessary for one to (do sth) |
| 某人必须… |
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4. | be necessary for |
| 必须|有¥的必要 |
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5. | It was necessary to move speedily. |
| 行动必须迅速。 |
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6. | It was necessary to recognize, |
| 必须认识到, |
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-- 来源 -- 新概念英语第四册 - Patterns of culture |
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7. | Redoubled caution became necessary. |
| 必须格外谨慎。 |
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8. | REPLACE THE BULB AS NECESSARY. |
| 必须更换灯泡。 |
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9. | Is it necessary to change trains? |
| 必须换车吗? |
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10. | It is necessary that one should. |
| 某人必须…。 |
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