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| 51. | take up; adopt |
| 开始从事;引入 |
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| 52. | inch-long mollusk imported accidentally from Europe; clogs utility inlet pipes and feeds on edible freshwater mussels. |
| 一英寸长的软体动物，偶然从欧洲引入；阻塞公共的管道入口，吃淡水贻贝。 |
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| 53. | polyvinyl chloride drop wire |
| 聚氯乙烯引入线 |
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| 54. | power lead-in panel |
| 电源引入盘 |
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| 55. | widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States. |
| 广泛分布于欧洲的杂草，有带刺的舌状的叶子和黄花；美国引入。 |
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| 56. | reactivity insertion |
| 反应性引入 |
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| 57. | European biennial introduced in North America having flower heads in crowded clusters at ends of spiny-winged branches. |
| 北美已引入的欧洲两年生植物，在多刺的枝杈末端有拥挤的头状花序。 |
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| 58. | A pulling or drawing inward. |
| 吸入拉入，引入 |
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| 59. | European thistle with rather large heads and prickly leaves; extensively naturalized as a weed in the United States. |
| 有很大的头状花序和多刺的叶子的欧洲蓟；在美国作为野草广泛引入。 |
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| 60. | leading-in insulator |
| 引入绝缘管 |
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