metamorphic period

• 变质期

metamorphic period的用法和样例：

例句

1. It can not only prolong the retention period of flavor, but also avoid flavor metamorphism because of tobacco burning at the high temperature.
   因为这一方法既能延长香精的保留期，又能避免烟丝高温燃烧而使香精变质的缺点。
2. The khondalite lithology is composed of a suit of metamorphic aluminium-sedimentary rock.During the Jinning movement, the sedmentary rock experienced four stages of metamorphism.
   明确黄陵地区孔兹岩系为一套变质的富铝质沉积岩组合，在晋宁期造山运动期间该套岩系经历四期变质作用。