形花样；

1. 曲折回纹：key parameter ==> 主要参数 | key pattern ==> 曲折回纹 | key personnel ==> 主要人员

2. 万字饰：? isolated pattern:大花纹 | ? key pattern:万字饰 | ? knit-and-float design:编织-浮点花纹

1. an ornamental pattern consisting of repeated vertical and horizontal lines (often in relief)

    e.g. there was a simple fret at the top of the walls

    Synonym: fretGreek fretGreek key