ADJ having a cross section that is an equilateral triangle 有等边三角形截面的
a three-square file
three-square rule三棱尺
three-square scraper[机] 三角刮刀
three-square scale三棱尺
three-square file[机] 三角锉;中三角锉;三相变压器
three-phase square wave三相方波
three-square oil stone三角油石
three-square moderate mechanism三方协调机制
three-valued square waveform exciting mode三值方波励磁
Three-star square card cue三星级方牌球杆
ADJ（形容词） having a cross section that is an equilateral triangle 有等边三角形截面的
a three-square file