求翻译：对于外语学习者来说要想提高听力必须有足够的输入才有足够的输出。作为大学生, 听力能力的提高不能只依靠课堂上的有限的学习时间而应该是课下大量的自主学习。是什么意思？

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Must want to enhance the hearing regarding the foreign language learner to have to have the enough input only then to have the enough output.But as the university student, the hearing ability enhancement cannot only depend upon in the classroom the limited study time to be supposed to be under the c

For foreign language learners to want to improve your hearing, you must have sufficient input have sufficient output. As a college student, to improve listening competence cannot depend only on the class, with the limited study time should be the course of a large number of independent study.

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