词根词缀：hydro-, hydra-, hydr-, hyd-

【来源及含义】Greek: water

【相关词根词缀】 Cross references of word families that refer to "water": aqua-; hydat-; hygro-.

【同源单词】ahydrotaxis, anhydrase, anhydration, anhydride, anhydrobiosis, anhydrous

词根词缀：spac-, spat-

【来源及含义】Latin: room, area, distance, stretch of time; space

【同源单词】aerospace, aerospace engineering, cyberspace, expatiate, expatiation, hydrospace