曾经
(refers to something that happened previously)onceat one time
策划, 测绘, 测良, 测量, 策略, 厕所, 侧躺, 测验, 测验结果, 侧重, 涔, 岑, 噌, 蹭, 层, 曾, 层层, 层出不穷, 层次, 层见迭出, 层理, 层压, 层云, 层子, 蹭, 叉, 差, 喳, 插, 杈, 差别, 差额, 差劲, 差距, 插曲, 插入, 插图, 差异, 插座, 碴,