Vaccine ‘Patch’ More Effective than Injections
Vắc-xin Áp Bì Hiệu Quả Hơn Tiêm Chích
Intermediate Level
https://www.facebook.com/le.quocan.146/videos/395204022053105/
Bryan Lynn.
Bryan Lynn wrote this story for Learning English,
based on reports from the University of North Carolina at...
