| 1. | Because the behavior of an economy reflects the behavior of the individuals who make up the economy , we start our study of economics with four principles of individual decision - making
因为经济的行为反映组成经济的个体的行为，我们以个体做决定的4原则来开始经济学的研究。 |
| 2. | The role of natural selection in evolution was formulated only a little more than a hundred years ago , and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied
自然选择在进化选择中的作用仅百年之余，而环境对个体行为的选择进化作用才刚开始被认识和研究。 |
| 3. | The role of natural selection in evolution was formulated only a little more than a hundred years ago , and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied
阐明自然选择在进化中的作用仅100多年，而环境在塑造和保留个体行为的选择作用才刚被认识和研究。 |
| 4. | The role of natural selection in evolution was formulated only a little more than a hundred years ago , and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied
标明自然选择在进化中的作用仅100多年，而环境形式和保留个体行为的选择作用才刚开始被认识和研究。 |
| 5. | The role of natural selection in evolution was formulated only a little more than a hundred years ago , and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied
自然选择在进化中的作用在只在百年前才被阐明，而环境在形成和维持个体的行为时的选择才刚刚开始被认识和研究。 |
| 6. | 3 the role of natural selection in evolution was formulated only a little more than 100 years ago , and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied
科学家阐明自然选择在进化中的作用只有100多年的历史，而认识和研究环境在个体行为形成和维持的选择作用才刚刚开始。 |
| 7. | The role of natural selection in evolution was formulated only a little more than a hundred years ago , and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied
进化论中的自然选择学说仅仅是在一百多年前形成，但是在人物个体的修整和维持方面的环境选择则是刚刚被认识和研究。 |
| 8. | The role of natural selection in evolution was formulated only a little more than a hundred years ago , and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied
自然选择在进化中的作用仅在一百多年前才得以阐明，而环境在塑造和保持个体行为时的选择作用则刚刚开始被认识和研究。 |
| 9. | The role of natural selection in evolution was formulated only a little more than a hundred years ago , and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied
仅在一百多年前，自然选择在生物进化中的作用才被阐明，而外界环境选择对个体行为形成和维持的作用才刚刚被认识和研究。 |
| 10. | The role of natural selection in evolution was formulated only a little more than a hundred years ago , and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied
行为科学之所以发展缓慢，部分原因是用来解释行为的依据似乎往往是直接观察到的，部分原因是其他的解释方式一直难以找到。 |
