The geologist does well to regard granite as a compound of quartz, felspar, and mica.
地质学家认为花岗岩是石英，长石和云母的混合物非常好。
2
Thiomersal does not contain methyl mercury, which is a naturally-occurring compound and whose toxic effects on humans have been well studied.
硫柳汞不含有甲基汞，后者是一种自然产生的化合物，其对人类的有毒影响已得到充分的研究。
3
"There is a compound in traditional Chinese herbs that can stimulate fracture repair," o 'keefe says. "it alters a signaling pathway well known to regulate bone formation."