Unit 1flashcard快闪存储器卡Vocabulary字汇aloud大声地pronunciation发音specific特性memorize记住grammar语法differently不同的frustrate挫败frustrating挫败quickly很快的add增加excited兴奋not at all一点也不end up结束pronounce宣布spoken口语的slowly缓慢的mistake错误make mistakes制造错误comma逗号challenge挑战solution解决later on稍后realize了解matter物...
