n. the most favorable environment for a plant or animal
n. one of four substances thought in ancient and medieval cosmology to constitute the physical universe
n. the situation in which you are happiest and most effective
n. a straight line that generates a cylinder or cone
n. 元件, 元素, 要素
[计] 部分; 成分; 单元; 码元; 元件; 元素; 单元