zuò / zhě / yòng / mó / shēng / cí / miáo / xiě / chuāng / wài / chuán / lái / de / niǎo / jiào / shēng / 。

作者用摹声词描写窗外传来的鸟叫声。

The author uses onomatopoeic words to describe the birdsong coming from outside the window.