lóng / niǎo / zài / chuāng / biān / tiào / lái / tiào / qù / què / shǐ / zhōng / wú / fǎ / fēi / xiàng / shù / lín

笼鸟在窗边跳来跳去，却始终无法飞向树林。

The caged bird hopped back and forth by the window but could never fly into the woods.