'Wingu' sounds like 'wing,' birds have wings and fly in the 'clouds.'

wingu “听起来像是“wing”鸟类在“cloud”中展翅飞翔。”

youdao

Now his wing the wave caresses, now he rises like an arrow, cleaving clouds and crying fiercely, while the clouds detect a rapture in the bird's courageous crying.

一会儿翅膀碰着波浪，一会儿箭一般地直冲向乌云，它叫喊着，——就在这鸟儿勇敢的叫喊声里，乌云听出了欢乐。

youdao

Now his wing the wave caresses, now he rises like an arrow, cleaving clouds and crying fiercely, while the clouds detect a rapture in the bird's courageous crying.

一会儿翅膀碰着波浪，一会儿箭一般地直冲向乌云，它叫喊着，——就在这鸟儿勇敢的叫喊声里，乌云听出了欢乐。

youdao