7. The loss of sulphuric acid has been reduced by five-sevenths.
硫酸的消耗量减少了七分之五。
8. The number of countries having diplomatic relations with China has increased to more than 1 00.
和中国建立外交关系的国家已增至100多个。
9. Petrochemicals today account for one fourth of all the chemicals made ： in ten years this amount is expected to double.
石油化工产品现在已占各种化学制品的四分之一，预计十年之后，这一数字还要翻番。
10. The United States Census Bureau notes that the population of the world still is expected to increase by more than 25% in the next 13 years.
美国人口普查局指出，在今后十三年中，世界人口预计将增加25%以上。
11. If the sound-absorbing surface A is doubled , the reverberation time T is halved，and the sound level L reduced by 3 db,
如果吸声面积A增大一倍，那么混响时间T就会减少一半，而声级L就降低三分贝。
12. The population of France was less than two-thirds that of Germany.
当时，法国人口还不到德国人口的三分之二。
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