外教讲解地道美语 第239期:工作经历
2011-09-18来源:和谐英语
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frustrating adj. 令人泄气的, 使人沮丧的
slowly but surely 缓慢而稳步地
to prove oneself 证明自己有能力
long-term a.长期的
challenging a.具有挑战性的