Selective and voluntary COVID19 testing in US is useless unless you test and track everybody! After 2 years, we still have not learned our lessons! All forms and no substance for show only. 除非您對每個人進行測試和跟踪，否則在美國進行選擇性和自願測試是沒有用的！ 2年後，我們仍然沒有吸取教訓！ 一切形式，無實質，祇會做秀.
Johnson Choi Biz 