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51. | Introduction and Allegro |
| 引子与快板 |
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52. | introduction to education |
| 教育导论 |
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53. | introduction of weaponry |
| 引进武器 |
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54. | Introduction to Geography |
| 地理学概论 |
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55. | introduction pneumatic valve |
| 进气阀 |
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56. | Introduction to Aesthetics |
| 美学概论 |
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57. | Introduction to Gemmary |
| 宝石学概论 |
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58. | Introduction of libraries: |
| 图书馆简介: |
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-- 来源 -- 常用英语情景表达100(1) - Part 23 At the Library (1) |
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59. | Introduction to Hydrdulics |
| 液压概论 |
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60. | Introduction to Computers |
| 计算机概论 |
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