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. But, of the vertebrates, unpredictable Nature selected only snakes (and one lizard).
    但是在脊椎动物中, 神秘莫测的大自然只选择了蛇(和一种蜥蜴).

3. But, of the vertebrates, unpredictable Nature selected only snakes (and one lizard).
    但是在脊椎动物中, 神秘莫测的大自然只选中蛇(和一种蜥蜴)

4. But, of the vertebrates, unpredictable Nature selected only snakes (and one lizard).
    然而，在脊椎动物中，大自然神秘模测地只选择了蛇（还有一种蜥蜴），

5. By having to sleep in the open, he gets far closer to the world of nature than most of us ever do.
    由于被迫在露天睡觉，他比我们中许多人都离大自然近得多。

6. By itself, nature can keep the balance and provide plenty of clean water for us. Nature recycles water.
    大自然本身能够保持水的平衡并给我们提供充足的净水。大自然能够使水得到反复循环利用。

7. But a series of new environmental laws, together with the creation of parks and nature preserves that cover one quarter of the country, are aimed at protecting Costa Rica’s remaining forests.
    但是人们制订了一系列新的环境保护法，还新建了占四分之一国土面积的公园和自然保护区，目的是要保护哥斯达黎加现存的森林。

8. For it is impossible to foretell the exact nature of the difficulties which will confront the pot-holer.
    因为无法预见到洞穴探险者究竟会遇到什么性质的困难。

9. When you adduce evidence of this nature, you must be sure of your sources.
    在你提供实质性的证据时, 你必须知道这个证据的来源。

10. What is called ´modern civilization´ is not the result of a balanced development of all man´s nature,
    所谓"现代文明"并不是人的天性平衡发展的结果，