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21. | abstract category |
| 抽象范畴 |
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22. | stract alphabet |
| 抽象字母 |
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23. | scientific abstraction |
| 科学抽象 |
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24. | abstract conceptualization |
| 抽象概念化 |
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25. | mental experiment |
| 抽象试验 |
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26. | abstract behavior |
| 抽象行为 |
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27. | principle of abstraction |
| 抽象原则 |
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28. | abstract community |
| 抽象群落 |
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29. | procedural abstraction |
| 过程抽象 |
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30. | abstract operator |
| 抽象算子 |
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