| 1. | Certain particles will exert equal forces . 某些尘粒将受到相等的力。
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| 2. | The pain is often exacerbated by certain foods . 某些食物常加重疼痛。
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| 3. | The story has a certain bizarre interest . 这个故事听起来别有风味。
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| 4. | I didn't tell him i would come for certain . 我并没对他说我一准来。
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| 5. | Any substitute was certain to be worse . 任何替代肯定会稍逊一筹的。
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| 6. | I'm quite certain it would break his heart . 我断定那是会叫他心碎的。
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| 7. | I was certain that they knew who i was . 我是十拿九稳他们知道我是谁。
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| 8. | Certain types of steel don't bore well . 有些品种的钢材不容易打眼。
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| 9. | They do n't want a rerun of a certain event . 他们不愿让事件重演。
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| 10. | All this cannot make progress certain . 所有这些都不可能确实保证进步。
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