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| 41. | drilling practice |
| 钻井实践；钻井习用方法；钻井作业；钻井参数 |
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| 42. | teaching practice |
| 教学实习|试教 |
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| 43. | social practice |
| 社会实践 |
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| 44. | practice handwriting |
| 练习写字 |
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| 45. | firing practice |
| 射击演习 |
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| 46. | administrative practice |
| 行政方式 |
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| 47. | duplex practice |
| 双联炼钢法 |
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| 48. | mental practice |
| 心智练习 |
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| 49. | furnace practice |
| 炼炉操作|炉况 |
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| 50. | practice lesson |
| 实习课|练习课 |
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