词根词缀：ath-, athl-

【来源及含义】Greek: struggle, a contest [in war or in sports], to contend for a prize; physical activity, rigorous self-discipline or training

【同源单词】ascesis, ascetic, ascetic, asceticism, athlete, athletic

词根词缀：penta-, pent-, pente-, pento-

【来源及含义】Greek: five; a number used as a prefix

【同源单词】molybdenum pentachloride, pentacanth, pentacanthous, pentachord, pentacle, pentactinal