1. Nature has a perfect system for recycling water.
    大自然拥有一套循环使用水的完美系统。

2. Nature has an unchanging amount of water.
    大自然里水的总量是不变的。

3. Nature
    自然

4. Nature doesn't care if human beings are here or not.
    自然界并不在乎人类是否存在。

5. He is forever talking about the closeness to nature and the gentle pace of living.
    他总是把与大自然的接近和安详的生活喋喋不休地谈。

6. He was of an excitable nature.
    他天生易激动。

7. He is timid by nature.
    他生性胆小.

8. Habit is a second nature.
    习惯成自然。

9. He is forever talking about the friendly people, the clean atmosphere, the closeness to nature and the gentle pace of living.
    他滔滔不绝地大谈友好的农民，洁净的空气，贴近大自然的环境和悠闲的生活节奏。

10. His periods of silence were not his basic nature, but the result of moods.
    他的沉默寡言决非天性，而是情绪使然。