None of which quite match any known, current technologies, but all of which seem to be  understandable through some reverse engineering.

其中没有一个与任何已知的、当前的技术完全匹配，但所有这些似乎都可以通过一些逆向工程来理解。

The term Li-Fi was coined by Edinburgh University’s Prof Harald Haas though the technology is also known as visible light communications (VLC).

Li-Fi 一词是由爱丁堡大学的 Harald Haas 教授创造的，尽管该技术也被称为可见光通信 (VLC)。

Mr. Johnson notes the importance of four subjects -- science, technology, engineering and mathematics, commonly known as STEM. He says presenting these subjects in a fun way is sure to have a good effect.

约翰逊先生指出了四门学科的重要性——科学、技术、工程和数学，通常称为 STEM。他说，以有趣的方式呈现这些主题肯定会产生良好的效果。