仅仅50毫克的咖啡因就能产生药理效果。As little as 50mg of caffeine can produce pharmacological effects.凭经验估计，一杯过滤咖啡约含80毫克咖啡因。As a rule of thumb, a cup of filter coffee contains about 80mg of caffeine.每次服用大约60毫克，每天最多4次，或遵医嘱。Take approximat...
His opponents viewed him as stubborn, dogmatic, and inflexible.他的反对者们认为他固执、教条、僵化。He's as stubborn as a mule .他像骡子一样倔。Serves her right for being so stubborn.她太固执了，活该。stubborn pride死要面子Facts are stubborn things.纸包不住火...
One of the waitresses arrived with a very odd-looking dish.一位女招待端来一道样子相当古怪的菜。The waitresses are all done up in costumes.女服务生都穿着制服.Waiters and waitresses work in restaurants, hotels, cafe and snack bars.男女服务员在餐馆, 旅馆, 咖啡馆,...