Collins is a mechanical engineer with a background in aerosol science.

柯林斯是一位有气溶胶科学背景的机械工程师。

He's a mechanical engineer with a background in aerosol science, and he has converted his home bathroom into a facility where he tests different masks and reviews them on YouTube.

他是位有气溶胶科学背景的机械工程师，他将自家卫生间改造为测试不同口罩的场所，并在油管上做评测。