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| 31. | terroristic threat |
| 令人恐怖的凶兆 |
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| 32. | security threat |
| 对安全的威胁 |
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| 33. | abandonment threat |
| 抛弃威胁 |
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| 34. | an empty threat. |
| 无力的威胁 |
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| 35. | pollution threat |
| 污染威胁 |
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| 36. | unilateral threat |
| 单方恐吓 |
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| 37. | explicit threat |
| 不加掩饰的威胁 |
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| 38. | 1962年，雷切尔·尔森佐证翔实的纪实文献《寂静的春天》，讲述了农药对环境与人类健康带来的危险，成为当时的畅销书。 |
| In1962 Silent Spring, Rachel Carson's well-documented account of the environmental and health risks of pesticides, became a best-seller. |
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| 39. | imminent threat |
| 紧迫的威胁 |
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| 40. | a covert threat |
| 隐蔽的威胁。 |
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