珀西对兰花的痴迷可以回溯到1951年。Percy's enchant-ment with orchids dates back to 1951.这个城镇的历史可回溯到中世纪.The history of the town dates back to the Middle Ages.注意:我们还要回溯所忽略的字符.Note that we back up over ignored characters too....
Theresearchers studied how keratinocyte cells near the surface of skinreact to sun exposure.研究者研究靠进皮肤表层的角质化细胞是如何应对日光照射.Keratinocyte culture provides a new thought and approach for wound closure of area burned patients.表皮...
她送儿子上了东部的一所寄宿学校。She sent her son to a boarding school in the East.1875年,来自东部的拓荒者在这个地区定居下来.Pioneers from the East settled in this region in 1875.在肯尼亚东部的塔纳河一带经常发现陷入沼泽的大象。Elephants were often to be found in swamp in eastern...