#每日学单词# Nidus /ˈnʌɪdəs/  名词：1、（医学）A place in which bacteria have multiplied or may multiply; a focus of infection. 细菌繁殖或可能繁殖的地方;感染的焦点。例句：The central venous catheter, or an associated thrombus, can act as a nidus for infection.’ 2、A place or situation in which something develops or is fostered. 培养或培养某物的地方。例句：With Helen at the core, his nidus, Don's shiniest facet was as a family man.’ 出现于17世纪晚期，源自拉丁语‘nest’。