有各种各样的文化和语言损耗的原因。

There are a variety of reasons for the loss of cultures and languages.

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作为语言习得研究的逆向过程，国外语言损耗研究已经有30多年的历史并建立了许多相对完整的理论框架和独特的研究途径。

The study of language attrition abroad has a history of over 30 years and many theories and approaches have been put forward.

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外语学习活动不仅要抓住教和学两个关键环节，同时也不能轻视语言知识和技能的损耗现象。

Language teaching and learning are the mostly studied areas in foreign language learning, while foreign language attrition, which is of equal importance, has often been neglected in practice.

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