词根词缀：cyclo-, cycl-, -cycle, -cyclic, -cyclical, -cycles
【来源及含义】Greek: around, round, circle, circular
【相关词根词缀】 Related "around, round, surrounding" units: ambi-; ampho-; circ-; circum-; gyro-; peri-.
【同源单词】acyclic, anticyclone, anticyclonic, bicycle, biogeochemical cycle, cycle
词根词缀：tri-, tre-
【来源及含义】Greek > Latin: a numerical prefix meaning, three, thrice, threefold; triple; a word element for number 3
【相关词根词缀】 Cross references of word families that are related, partially or totally, to: "three, third": terce-; terti-; trigono-; trito-.