an officer of middle rank in the army, navy, or air force （陆军）中尉；（海军或空军）上尉 Lieutenant Paul Fisher 保罗 · 费希尔陆军中尉
(in compounds 构成复合词 an officer just below the rank mentioned 仅低于…官阶的官员 a lieutenant colonel 中校
(in the US) a police officer of fairly high rank （美国警察的）一定级别的警官 a person who helps somebody who is above them in rank or who performs their duties when that person is unable to 副职官员；助理官员；代理官员 see also Lord Lieutenant
Word Originlate Middle English: from Old French (see lieu, tenant).