He was doing experiments in a gas discharge tube.
实验是在一个气体放电管中进行的。
By the time he was ten, Edison was already doing his experiments in chemistry.
爱迪生十岁时，就已经开始做化学实验了。
By the time he was ten, Edison was already doing his experiments in Chemistry.
爱迪生十岁时，已经开始做化学实验了。
By the time he was ten, Edison was already doing his experiments in Chemistry.
爱迪生十岁时，已经开始做化学实验了。
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