词根词缀：sphero-, spher-, -sphere-

【来源及含义】Greek: ball, round, around; globe, global; body of globular form; by extension, circular zone, circular area

【相关词根词缀】 Related ball, sphere-word units: glob-, glom-; hemoglobin-.

【同源单词】adminisphere, aerosphere, allobiosphere, anthroposphere, asphere, aspheric

词根词缀：tropo-, trop-, -tropal, -trope(s), -tropic, -tropism, -tropia, -tropous, -tropy, trep-

【来源及含义】Greek: bend, curve, turn, a turning; response to stimulus

【相关描述】Don't confuse this tropo-, -tropy element with tropho-, meaning "food, nourishment, nutrition".

【相关词根词缀】 Inter-related cross references involving word units meaning "bend, curve, turn": diversi-; diverticul-; flect-, flex-; gyro-; meand-; -plex; streph-; stroph-; tors-; verg-; vers-; volv-.

【同源单词】acrotropic, acrotropism, aerotropic, aerotropism, ageotropism, allotrope