作者自己的介绍
由作者本人在 YouTube 上撰写，Youtop 未做修改。
Practical Engineering is all about infrastructure and the human-made world around us. It is hosted, written, and produced by civil engineer, Grady Hillhouse. We have new videos posted every first and third Tuesday, so please subscribe for updates.
Practical Engineering: Deciphering Our Constructed World
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