LONDON, June 19 (Xinhua) -- Britain recorded its hottest day of the year on Thursday as an amber heat health alert was issued across England. According to the Met Office's latest forecasts, much of ...

艾滋病 防治迎来重大进展：美国食品药品监督管理局（FDA）近日批准了一种全新、长效的预防性注射药物——Yeztugo（通用名：lenacapavir）， 只需每半年注射一次 ，就能有效防止 HIV ...