externalityn.
英 ,ekstɜː'nælɪtɪ | 美 ,ɛkstɚ'næləti
中文n. 外在性；外形；外部事物
词根词源
externality (n.)1670s, "state of being external," from external + -ity. From 1839 as "that which is external." From 1833 as "undue regard for externals."
关键词