(noun.) the most favorable environment for a plant or animal; 'water is the element of fishes'.
(noun.) a straight line that generates a cylinder or cone.
(noun.) the situation in which you are happiest and most effective; 'in your element'.
(noun.) one of four substances thought in ancient and medieval cosmology to constitute the physical universe; 'the alchemists believed that there were four elements'.
录入:内德
整理:罗德尼