他们好像在分享一个秘密。

They seem to be sharing a ___secret.

他们约定在公园见面是个秘密。

Their meeting at the park was a ___secret.

这家面包店的成功秘诀在于他们独特的发酵工艺。

The bakery's ___secret lies in their unique fermentation technique.

她把秘密日记藏在了抽屉最下面。

She keeps her ___secret diary hidden at the bottom of the drawer.