Up to that point, chapters 1 through 4 cover the general scientific method, experiment and observation, and simple systems and definitions.
到现在为止，第1章到第4章介绍了一些通用的科学方法、实验和观测，以及一些简单的系统和定义。
Observation, reason and experiment make up what we call the scientific method.
观察，推理和实验，这些内容构成了我们所说的科学方法。
The material and method for the experiment, observation and results, growth characteristic and product, control of insects were explained respectively.
文章对耳叶马兜铃引种试验的材料与方法、试验内容与结果、生长特性及产量以及病虫害的防治，分别作了阐述。
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