21. | Counting is the germ of arithmetic . |
| 计数是算术的第一步。
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22. | The child is good in arithmetic . |
| 这小孩的算术很好。
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23. | Arithmetic is the one fundamental science, underling all other physical sciences. |
| 算数是唯一构成其他一切自然科学基础的一门科学。
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24. | clever at arithmetic |
| 擅长算术的
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25. | give the pupils a test in arithmetic |
| 对小学生进行算术测验
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26. | modern methods of teaching arithmetic |
| 现代教算术的方法
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27. | do arithmetic |
| 进行计算
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28. | faulty political arithmetic |
| 错误的政治估计
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29. | mental arithmetic |
| 心算
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30. | an expert in arithmetic |
| 精于算术的人
|