雄心[xióng xīn]
great ambition; lofty aspiration:
例:树立雄心
set up high aims and lofty aspirations; set one's sights high;
没有雄心
without ambition;
玛丽雄心很大, 竟想在四个月里学会用汉语流利地会话。
Mary is ambitious enough to aspire to conversational fluency in Chinese in four months.