In the late 1940s Georg Neumann, a German engineer, succeeded in fine-tuning the battery's chemistry to avoid this problem, making a sealed version possible.

1940年代晚期，德国工程师Georg Neumann成功地微调了电池的化学机制，从而消除了这个问题，使得将之密封包装成为可能。

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Being an engineer sounded good to me. I found out early that I liked chemistry, so I took up chemical engineering.

我想，“工程师”听上去还不错，并且我喜欢化学，所以我选择了化学工程专业。

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