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11. | One that serves as a guardian or protector. |
| 守护人的,保护者作为守护人或保护者的人 |
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12. | A plastic membrane serves as selective diffusion barrier. |
| 一层塑料薄膜起着选择性渗透屏障的作用。 |
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13. | A mother's body serves as a reservoir. |
| 母体可作为一种贮藏库。 |
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14. | any substance that serves as a denaturing agent. |
| 任何促使性质改变的物质。 |
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15. | something that serves as a means of transportation. |
| 作为运输工具的东西。 |
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16. | Maathai currently serves as deputy environment minister. |
| 马塔伊现在担任肯尼亚环境部副部长。 |
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17. | One that serves as a means; an instrumentality. |
| 工具充当工具的东西;工具 |
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18. | He serves as a clerk in a bank. |
| 他在一家银行当办事员。 |
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19. | One that serves as a substitute for another. |
| 补缺者代替另一人的人 |
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20. | Something that serves as an obstacle; a barrier. |
| 路障用来作为障碍的东西;障壁 |
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