这件古董的珍贵之处在于它保存完好且历史悠久。

The ___preciousness of this antique lies in its excellent preservation and long history.

他那种矫揉造作的举止让人觉得很不自在。

His ___precious behavior made everyone feel uncomfortable.

她小心翼翼地保存着祖母的旧照片，深知它们的珍贵之处。

She carefully preserved her grandmother's old photos, knowing their ___preciousness.