black sequence

• 黑色岩系

black sequence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。