21. | Middle C is equivalent to 256 vibrations per second. |
| 中央C音相当于每秒钟振动256次。
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22. | You must allow for five per cent wastage in transit. |
| 在运输中要允许有百分之五的损耗量。
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23. | Ten per cent of the work-force will be made redundant. |
| 有百分之十的劳动力要裁减掉。
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24. | The miners work (for) 38 hours per week. |
| 这些矿工每星期工作(达)38小时。
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25. | What is the yield per acre? |
| 每英亩的产量是多少?
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26. | Let's assume, for the sake of argument, that inflation will remain at 5% per year for two years. |
| 为便于讨论,咱们先假设通货膨胀率连续两年均为5%。
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27. | It costs 10 per metre, no, scrub that, it costs 12 per metre. |
| 这个价钱是每米10英镑,不,应该说是每米12英镑。
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28. | I got 96 per cent, he got 94, so I beat him by a short head. |
| 我得96分,他得94分,我仅超过他一点。
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29. | Write on the form that you stayed so many nights at so much per night. |
| 把你住了几个晚上, 每晚多少钱,填在这个表上。
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30. | The speed limit is 40 miles per hour. |
| 规定的最高时速为40英里。
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