mineralization material source 基本例句 物质来源 A companion star is a perfect source of infalling material for a black hole.伴星是物质下陷形成黑洞的一个极好的物质来源。 The material sources of the granitoid rocks at Baimajian in the northern Dabie are different.北大别花岗岩类岩石的物质来源并不一致。