成层了的，层积了的，分层的；正，术>分层，成层( stratify的过去式和过去分词 )；

1. deposited or arranged in horizontal layers

    e.g. stratified rock

    Synonym: bedded

2. (used of society) socially hierarchical

    e.g. American society is becoming increasingly stratified

    Synonym: class-conscious

3. arranged in a sequence of grades or ranks

    e.g. stratified areas of the distribution

    Synonym: gradedranked