求翻译：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。是什么意思？

"I +1" statements "comprehensible input" this important point. "I" is the acquisition of existing language skills, students can understand the language of the amount of material. "1" is the separation distance of the current language of the state of knowledge and state of the next stage of the langu

He used the "I+1," stated "understandable" enter this important point. The "i" are learned in the existing language level, students are able to understand the language of the material. The " 1" is the current knowledge of languages and language status the next phase of the interval distance. Input c

He used “i+1” to indicate “has been possible to understand the input” this important viewpoint.“i” is the custom existing language proficiency, is language material quantity which the student can understand.“1” is the current language knowledge condition and the next stage language condition gap dis

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