| 71. | The third , or main. |
| 第三种波，即主波，
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| 72. | The third , or main wave, is the slowest and has travelled round the earth through the surface rocks. |
| 第三种波，即主波，是最慢的，是围绕地球通过表面岩石传来的。
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| 73. | Moreover, there is still a third compound, red lead, the well-known paint. |
| 此外，还有第三种化合物：红铅，是人们熟悉的颜料。
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| 74. | Edgar Snow began now what might be considered the third part of his life. |
| 于是，埃德加·斯诺开始了或许他一生中的第三个篇章。
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| 75. | Any cone is a third part of the cylinder which has the same base with it and equal height. |
| 任一(正)圆锥是与其同底等高圆柱的三分之一。
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| 76. | But the Third Reich had passed into history. |
| 但是第三帝国却成为历史。
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| 77. | The change met the technical requirements of the new age by engaging a large profess signal element and prevented the decline in efficiency that so commonly spoiled the fortunes of family firms in the second and third generation after the energetic founders. |
| 这种变化通过引入许多的专业因素从而适应了这个新时代的技术要求， 并且它(这种变化)防止了效率的降低。这种效率的降低在精力充沛的 创业者之后的第二代和第三代人(领导公司)的时候，经常会毁掉那些 家族公司的财富。
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| 78. | He is in the third grade. |
| 他读三年级。
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| 79. | This tennis player ranked third in the world. |
| 这位网球运动员排名世界第三。
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| 80. | He will come to see you on the third of April. |
| 他将于四月三日来看你。
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