unofficial
adj. 非官方的；非正式的
例句
Unofficial estimates put the figure at over two million.
非官方的估计数字为200万以上。
《牛津词典》
An unofficial grey market in the shares has been operating for about two weeks.
一个非官方的股票灰市已经运作了大约两个星期。
《柯林斯英汉双解大词典》
He assisted in unofficial ways with the routine legwork in various investigations.
他在多个调查中例行外勤以非正式的方式来进行协助。
