What began as a simple scientific experiment in the late nineteenth century has become one of the world's most popular and useful means of communication.
在十九世纪末期开始进行的一项简单的科学试验，已成为世界上最受欢迎最有用的通讯手段。
His scientific experiment was quite practical and simple and there was nothing weird about it at all.
他的科学实验既实用又简单，一点也不奇怪。
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。
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