VOA慢速英语:Improve Your Knowledge of English Words by Testing Yourself

短语讲解：

1. This information comes from Alicia Biler and Ray Knight.

come from 源自; 来自某处; 出生于
例句：He's just come from the countryside.
他刚从乡下来。

2. Biler adds that English learners need to see or hear a word about 10 times before they feel at ease with the word and start using it.

at ease 安逸，自由自在; 自然
例句：He is at ease about the matter.
他对这事很放心。

3. By repeatedly using flashcards -- and slowly building up the number of cards – you can remember more words.

build up 逐步建立; 增进; （在某个地方） 盖满了建筑物
例句：The regime built up the largest army in Africa
该政权逐渐建立起一支非洲规模最大的军队。