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What makes a person a scientist? Does he have ways or tools of learning that are different from those of others? The answer is no. It is not the tools a scientist uses but how he uses these tools that make him a scientist. You will probably agree that knowing how to use a power saw is important to a carpenter. You will probably agree, too, that knowing how to investigate, how to discover information, is important to everyone. The scientist, however, goes one step further, he must be sure that he has a reasonable answer to his question and that his answer can be confirmed by other persons. The scientist’s knowledge must be exact. There is no room for half right or right just half the time. He must be as nearly right as the conditions permit. What works under one set of conditions at one time must work under the same conditions at other times. If the conditions are different, any changes the scientist observes in a demonstration must be explained by the changes in the conditions. This is one reason that investigations are important in science. Albert Einstein, who developed the theory of relativity, arrived at this theory through mathematics. The accuracy of his mathematics was later tested through investigation. Einstein’s ideas were shown to be correct. A scientist uses many tools for measurement. Then the measurements are used to make mathematical calculations that may test his investigation. 科学家的知识必须要精确。没有半对或有时对这种余地。在条件允许时他必须正确。某时在某种条件下起作用的东西必须要在相同条件下的其他时间也起作用才行。如果条件不同，科学家观察到的任何变化都必须通过条件的变化来解释。这就是调查在科学中占据重要位置的原因。阿尔伯特·爱因斯坦相对论的发明是通过数学来实现的。他的数学的精确性后来通过研究得以验证。他的思想被证明是正确的。一个科学家运用很多工具来进行测量，然后测量数据被用于数学计算，这些数学计算或许能验证他的研究。 10. accuracy 准确（性）；精确（程度） 11. measurement 测量;度量 |
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