点击下方单词,选择对的这个单词
副词
1. 从前;原来;以前If something happened or was true formerly, it happened or was true in the past.
1. at a previous time
e.g. at one time he loved herher erstwhile writingshe was a dancer once
Synonym: onceat one timeerstwhileerst
多通过句子记忆单词,而不是单独死记硬背。