肺细胞约每周新老更替一次。Lung cells die and are replaced about once a week.昼夜更替.Day and night alternate.从事高等教育的人员新老更替极其缓慢。There has been very little renewal of personnel in higher education....
a beer with a whisky chaser喝啤酒后接着喝威士忌酒Are you a chubby chaser or something?你是对胖子有兴趣还是其他什么?Slang A shot of hard liquor , sometimes accompanied by a beer chaser.[俚语]一杯酒:一杯烈酒, 有时还加上点啤酒....
箭毒的现代临床应用可追溯至1932年.The modern clinical use of curare probably dates from 1932.它是箭毒碱,提取自一种南美产的植物.It is a curare alkaloid derived from the South American plant.自然界最致命的生物之一,是微小的箭毒蛙.One of nature's deadliest creatures i...