柯林斯词典adventitious /ˌædvɛnˈtɪʃəs/ 1. ADJ added or appearing accidentally or unexpectedly 外加的; 偶然的 返回 adventitious剑桥词典not expected or planned 偶然的;非計劃中的 an adventitious event /situation 偶然事件/意外情況 返回 adventitious