| 11. | We must find economical methods for extracting oil from shale. |
| 我们必须找到从页岩中提炼石油的经济方法.
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| 12. | problems of economical mismanagement. |
| 经济管理不善的问题。
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| 13. | Keep the charges as economical as possible. |
| 要尽可能节省费用。
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| 14. | The shortage of labour acts as a powerful spur to more economical methods of production. |
| 劳动里的缺乏有力地刺激了人们向更为经济的生产方式努力。
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| 15. | He bought it secondhand, being of an economical turn of mind. |
| 他生性节约，所以买的是旧货。
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| 16. | The University of Chicago has always been thought of as a model of economical operation. |
| 芝加哥大学一向被视为勤俭办学的典范.
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| 17. | The most economical age to capture an elephant for training is between fifteen and twenty years, for it is then almost ready to undertake heavy work and can begin to earn its keep straight away. |
| 捕捉15至20岁之间年龄的大象进行驯象最为经济。 这个年龄的象差不多已能干重活，可以很快挣回饲养它的开支。
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| 18. | consolidate economical administration |
| 加强经济管理
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| 19. | be economical in [with] the use of funds |
| 节约使用资金
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| 20. | an economical engine |
| 节省燃料的发动机
|