“C27”寫句子，用C27造句

2、High amounts of C27 steranes, regular steranes, 4-methyl steranes, long chain tricyclic terpanes for the western Qaidam oils indicate that the dominant organic matter source is algal material.

1、具有高含量的C27甾*、規則甾*、4-*基甾*、長鏈三環萜*，說明它們母質主要爲菌藻類；