During his first year in college, he work as a bottlewasher in a laboratory in the evening.
大学一年级的时候，他晚上在一个实验室里当洗瓶子的工人。
3
The article narrates the main functions and constitutes of bottle-washer machine with aseptic air, and studies the theory of ozone exterminating the germs and filter system of aseptic air.