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| 41. | Oxidation cannot occur without reduction. |
| 没有还原反应就没有氧化反应。 |
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| 42. | Grave worksite accidents frequently occur. |
| 重大安全事故时有发生。 |
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| 43. | Breast infections occur during lactation. |
| 乳房感染发生于授乳期。 |
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| 44. | To coexist or occur with. |
| 与…共存，与…一同发生 |
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| 45. | protein occur in all organism |
| 蛋白质存在于生物体中 |
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| 46. | Earthquakes occur frequently in Japan. |
| 日本时常发生地震。 |
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| 47. | pollination occur within the bud |
| 在花蕾内发生授粉 |
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| 48. | Important elections occur this fall |
| 今年秋季将举行重要的选举。 |
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| 49. | may occur in some areas. |
| 它会在某些地区发生。 |
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| 50. | They would occur anywhere, anytime. |
| 他们任何时候都可能发生,在任何地方. |
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