三迭纪 meaning in Chinese

tria ic period
tria icperiod
triassic period

In the area of the left bank , rock body is mainly composed of permian period - triassic period granite and triassic period siltstones and mudstones ( t2m ) . moreover , the rock body has been more faulted , such as f1 f3 f9 and so on . in addition , there also exist a lot of joints and form complex rock mass structure
工程区主要出露二迭纪三迭纪花岗岩体( _ 4 ~ 3 _ 5 ~ 1 )和三迭系中统忙怀组下段沉积岩( t _ ( 2m ) ~ 1 ) ，发育有工程区规模最大的f _ 1和f _ 3断层，以及其它断层和大量的各类断续延伸的裂隙，岩体结构较为复杂。
Past investigation found the rock in the right dam foundation composing of granite ( _ 4 ~ 3 _ 5 ~ 1 ) in dyas - trias , which has a very complicated mechanical environment . the complicated phenomenon is as follows : tectonism , alteration , rock mass demobilize , rock mass stress release and other factors . because of this several weakness rock zones and a loosen rock mass zone are develop in the right dam foundation
前期的调查表明其右岸岩体力学环境复杂，表现为：构成右岸坝基(肩)岩体主体的二迭三迭纪花岗岩( _ 4 ~ 3 _ 5 ~ 1 )受构造变动、蚀变、风化卸荷等因素的影响形成了坝基软弱岩带和坝肩上部卸荷松弛岩体。