求翻译：克拉申认为人类获取语言的唯一方式是获得可理解的输入。可理解输入指的是输入超出学习者的现有水平的语言材料[1]。他用“i+1”表述了“可理解输入”这一重要观点。“i”是习得者现有的语言水平,是学生所能理解的语言材料数量。“1”是当前语言知识状态与下一阶段语言状态的间隔距离。输入既不能太难理解，也不能太容易。如果输入太难，学习者将不会重视语言的输入，如果太过容易，学习者语言的习得成效不大。克拉申指出教导学生的最佳方法是向他们提供可理解性输入，即输入适合于学习者目前水平的语言材料。是什么意思？

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Kramer believes that the human being to acquire language is the only way to be understood. It is understandable that enter input out of the existing level of learning the language materials [ 1]. He used the "I+1," stated "understandable" enter this important point. The "i" are learned in the existi

Gram Raschen thought the humanity gains the input which the language only way is obtains may understand.May understand the input refers is the input surpasses learner's existing level language material (1).He used “i+1” to indicate “has been possible to understand the input” this important viewpoint

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