诗就是这样吧，不太讲究章法的。

我查到了George Cooper这首诗的原文：
Mother
Hundreds of stars in the deep blue sky,
Hundreds of shells on the shore together,
Hundreds of birds that go singing by,
Hundreds of bees in the sunny weather,
Hundreds of dewdrops to greet the dawn,
Hundreds of bees in the purple clover,
Hundreds of butterflies on the lawn,
But only one mother the world over.
其中的by作”past经过“解。《牛津高级英汉双语词典》上的原始例句： He walked by me without speaking.

go by singing