pet, petit = to seek, to strive 寻求，追求
compete：com-= together 共同；pet = to strive 追求；-e；【v】比赛；竞争：Two teams competed for the championship. 两队争夺冠军。
competent：compet(e) [v] 竞争；-ent [adj] 能···的；【adj】有能力的；胜任的：He is competent for the job. 他能胜任那项工作。
appetite：ap-(ad-)=to向；petit = to strive 追求；-e；【n】①欲望；爱好：She has an appetite for social activities. 她爱好社交活动。②食欲：to have a good appetite 食欲很好；
appetent：ap-(ad-)=to向；pet = to seek 追求；-ent [adj] ···的；【adj】渴望的：The patient was appetent for early recovery. 病人渴望早日康复。
petition：pet = to seek 寻求；-ion [n] 表行为；Ⅰ【n】请求；请愿书：to sign a petition for higher wages 在要求加薪的请愿书上签名；Ⅱ【v】请求；请愿：to petition for lower taxes 请求降低税收；
repetition：re-=again 再；petit = to seek or ask 追求；要求；-ion [n] 表行为；【n】①重说；重复：His speech is full of repetition. 他的发言重复太多。②重复的事物：He succeeded after many repetitions. 经过多次反复，他终于成功了。
impetus：im-(in-)= into, on 进；向前；pet = to strive 追求；-us [n] 事物；【n】动力；促进：The new policy gave an impetus to production. 新政策促进了生产。
impetuous：im-(in-)= into, on 进；向前；pet = to strive 追求；-u-；-ous [adj] 倾向···的；【adj】①猛进的：an impetuous wind 一阵猛风；②冲动的，鲁莽的：an impetuous decision 草率的决定；
