While for middle school students, vocabulary learning has always been difficult.

然而对中学生来说词汇学习一直是一个难点。

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There are many divarications under existed knowledge classification standards and the research of characters of knowledge in organization learning has always been confused.

现有的知识分类存在多种分歧，而对不同类型知识的性质研究也较易混淆。

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Whether achievement testing has positive or negative backwash effect on foreign language teaching and learning has always been a topic for discussion and study in the testing field.

沈阳体育学院现行体育英语专业高年级精读课考试没有最大限度提高正面反拨效应，且不利于学生能力培养。

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While learning American idioms has always been challenging, texting, email and social networks have generated a tidal wave of new slang and abbreviations in English.

WSJ: Mastering the Finer Points of American Slang

The impossible has always seemed possible and that is solely a result of all the great teachers and learning experiences I have been exposed to along the way.

WHITEHOUSE: Turn A Problem Into Your Passion

The most important learning has been the need to build a rigid financial structure and business model where the dash board is always 100 percent updated and accurate and that the out come can never be better than the quality of our MFI partners.

FORBES: Opportunity Africa: How One Social Venture Is Crowdsourcing the For-Profit Finance Model