1. Every solid object will reflect a sound, varying according to the size and nature of the object.
    任何固体者反射声音，反射的声音因物体的大小和性质的不同而不同。

2. We all know the importance of laying a solid foundation in everything we do, and in language study perhaps more than in anything else, a good beginning is half the battle.
    我们都知道，无论做什么事，重要的是要打下坚实的基础。语言学习尤其如此。俗说话：好的开端是成功的一半。

3. The boy is mustard on the theory of numbers and on solid geometry.
    这男孩对算术和立体几何有强烈的兴趣。

4. The further off this solid obstruction, the longer time will elapse for the return of the echo.
    固体障碍物越远。回声返回所用时间就越长。

5. Today these observations can seem quite commonplace, yet looking back one must view them as a solid landmark in malaria research.
    现在这些观察看上去好象很平常，然而回首往事时，人们定会把它们视为疟疾研究上一个坚固的里程碑。

6. This realization now entered my life like a flow of water dividing previously dry and solid ground, creating two banks, one of which was my past — so familiar and predictable that even my unhappiness then made me happy now just to think of it;
    这种认识就象一股水流一样流进我的生活，把先前干涸坚实的土地一分为二，造成了河流的两岸。河岸的一边是我的过去——这对我来说是如此熟悉, 如此地可以预料，以至于我只要想到它，原先使我感到不快的东西也会使现在的我变得开心起来。

7. The myth has it that Americans consume too much, since the creation of solid waste per person continues to climb.
    有种说法是，美国人消耗太多，因为他们的人均固体垃圾制造量在持续上升。

8. He gets the solid shape, as it were, inside his head----he thinks of it, whatever its size, as if he were holding it completely enclosed in the hollow of his hand.
    可以说，当他想像一个物体时，不管其大小如何，他脑子里得到的是一个立体的概念，就好像完全握在自己手心里一样。

9. He must, for example, perceive an egg as a simple single solid shape, quite apart from its significance as food, or from the literary idea that it will become a bird.
    以鸟蛋为例。观赏者必须感觉到它是一个单一的实体形态，而完全不靠它的食用意义或它会变成鸟这样的文字概念来感觉。

10. And even see through solid doors and walls.
    甚至能透过厚实的门和墙看到东西。