The rapakivi granites have a number of petrological peculiarities.

环斑花有若干石学的特征。

Perhaps the future role of the sedimentary petrologist will be as an interpreter and an arbiter of cases too complex for the machine to decide unaided.

沉积石学家来的作用也许是作为机械不能独立杂情况的释者和仲裁者。