black rock serials

• 黑色岩系

black rock serials的用法和样例：

例句

1. West Tianshan in Xinjiang is the part of Middle Asia Tianshan in China, Within West Tianshan, there are widely distributed Palaeozoic black rock series.
   摘要新疆西天山为中亚天山在中国境内的西延部分，分布有大量的古生代黑色岩系。