简介：维生素，又称维他命，适量摄取可保持身体健康，而过量则会中毒维生素已成为价值千亿美元的产业，Derek Muller博士讲述维生素的科学和历史，以及怎样合理摄取。 Almost one billion of us take a regular dietary supplement, mainly vi
简介：When Gem (Erica Hubbard) decided to invite her long-lost friend to be the Maid of Honor in her wedding, Allen (Brad James), her fiancé, had no clue he
