Question

Using "knew" meant that you use to know these words.这句不懂

Answer 1

Using "knew" meant that you use to know these words.中的meant 表示“意味着”,就是“用'knew'意味着你过去就知道这些单词了”.

句中use to 表示“过去常常（做某事）”；

be used to do 表示“习惯于做某事”