For a learner to benefit from the input, the language materials need to have a number of qualities: authentic, comprehensible and challenging.

对于一个学习者受益于输入的语言材料需要有一些品质：真实的，可理解的和富有挑战性的。

youdao

For a learner to benefit from the input, the language materials need to have a number of qualities: authentic, comprehensible and challenging.

对于一个学习者受益于输入的语言材料需要有一些品质：真实的，可理解的和富有挑战性的。

youdao