哺乳类起源于中生代宛若原始的爬虫类.Mammals arose from a fairly primitive reptile in the Mesozoic era.丹巴地区自中生代以来经历了多期的变形 、 变质和岩浆作用.Danba area has undergone multiperiod deformation, metamorphism and magmatism since Mesozoic time.热储由中生代燕山期花...
磁带成本高，而且每录制一次音质就会变差一些。Tape is expensive and loses sound quality every time it is copied.她的视力因年岁的增长而变差了.Her eyesight grew dim with age.房子不会因为几块烂木板就变差.A house isn't in poor condition because of a few rotten boards....