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| 1. | above a certain amount |
| 超过一定数额 |
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| 2. | Sure and certain are often used in the same way |
| sure和certain的用法常常是相同的 |
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| 3. | Penicillin is a certain cure to certain diseases. |
| 对于一定的疾病,盘尼西林是一定的药物。 |
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| 4. | Completely sure; certain. |
| 完全确信的；一定的 |
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| 5. | With `it' as an indefinite subject or object only certain can be used it |
| 作不定主语或不定宾语时,只可用certain与之连用 |
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| 6. | a certain extent |
| 一定程度上 |
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| 7. | Should and would are used in clauses after be certain,be determined,insist,etc |
| should 和would 用于从句中的be certain ,be determined,insist等词语之后 |
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| 8. | He is certain to succeed. |
| 他一定成功。 |
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| 9. | be traded at a certain price or under certain conditions. |
| 以一定的价格或者一定的条件买卖。 |
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| 10. | at a certain speed |
| 以一定的速度 |
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