te·tram·e·ter /tɛˈtræmətɚ/
四音步句
Te·tram·e·ter n. GR. & Latin Pros. A verse or line consisting of four measures, that is, in iambic, trochaic, and anapestic verse, of eight feet; in other kinds of verse, of four feet.
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tetrameter
n : a verse line having four metrical feet