最早，因为知道业主是搞幼儿教育出身的背景，所以想把主题定为富有童趣的“皮影”主题。

The earliest known, because owner is engaged in early childhood education background, so want to set the topic full of childlike "shadow" theme.

youdao

她未向他讲明自己的出身背景。

She didn't enlighten him about her background.

《牛津词典》

他的出身背景一般般，但绝算不上贫穷。

Though his background was modest, it was in no sense deprived.

《柯林斯英汉双解大词典》