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单词	tautochrone
释义	tautochrone noun tau·​to·​chrone ˈtȯtəˌkrōn plural -s : a curve which is a cycloid under a horizontal base and down which the time of descent under gravity from every point to the lowest point is the same Word History Etymology French, from taut- + Greek chronos time First Known Use circa 1774, in the meaning defined above
随便看	keep kosher keep mum keep off keep on keep on at keep on her boss's good side keep on her toes keep on his toes keep one jump ahead keep one out of action keep one's cards close to one's chest/vest keep one's cards close to the chest/vest keep one's chin up keep one's composure keep one's cool keep one's cool/composure keep one's distance keep one's eye on the ball keep one's eye out for keep one's eyes glued to keep one's eyes open keep one's eyes open (for) keep one's eyes open for keep one's eyes peeled keep one's eyes skinned

英语词典包含469781条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。