例句與造句

1. Its roots and cultural elements can be traced back several millennia into Eurasian culture, and were originally based on the subsequent overlapping and conflict-ridden superimposition of the three basic ethnic and cultural strata ( see stratification ( archeology ), social stratification, and archaeological horizon ) underlying all modern Indo-European cultures.
2. It's difficult to find seed stratification in a sentence. 用seed stratification造句挺難的