stratify

v. （使）层化

strangely, strangeness, stranger, strangle, stranglehold, strangler, strangulate, strangulation, strap, straphanger, strapless, strapped, strapping, strata, stratagem, strategic, strategically, strategist, strategy, stratification, stratoscope, stratosphere, stratum, straw, straw poll (also straw vote), straw-coloured, strawberry, strawberry-mark, stray, stray away from, streak, streaker, streaky, stream, stream of consciousness, streamline, streamlined, streamlining, street, street credibility (also ,street `cred),