| 1. | When did the accident occur ? |
| 事故是什么时侯发生的？
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| 2. | Misprints occur on every page. |
| 每页都有印刷错误。
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| 3. | References to pain occur throughout the poem. |
| 诗中字里行间流露出痛苦之情。
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| 4. | It is unthinkable that we should allow a nuclear holocaust to occur . |
| 我们若竟让核武器大屠杀的惨剧发生,简直是匪夷所思。
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| 5. | The disturbances seem to occur in waves. |
| 这种骚扰似乎是一阵一阵的。
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| 6. | Exceptions occur , but they are not frequent nor serious. |
| 例外是有的，但是它们既不经常，也不严重。
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| 7. | Volcanic eruptions on the island occur with great rarity. |
| 火山爆发在该岛极少发生。
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| 8. | The realization that a catastrophe could occur at any time sobered them up. |
| 灾难随时可能发生的这一认识使他们清醒过来。
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| 9. | It may occur (at) any moment. |
| 这随时都会发生。
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| 10. | It did not occur as an original conception. |
| 它的问世并不是什么独创。
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