他试图尽可能长久地保护孩子们的纯真。

He tried to protect the ___innocence of his children for as long as possible.

她在这些事情上的纯真既动人又有点令人担忧。

Her ___innocence in these matters is both touching and a little concerning.

独自在国外生活意味着对世界如何运转的纯真迅速丧失。

Living abroad alone meant a rapid loss of ___innocence about how the world works.