Not sure how sampling was done in China.

來源: 於 2020-02-09 12:20:19 [舊帖] [給我悄悄話] 本文已被閱讀：次

watch the demo video here. Swab doesn't made from cotton material. Should be nylon or polyester

https://www.youtube.com/watch?v=DVJNWefmHjE