隐秘

例句：

1. 1. The secret of the cure was kept from everyone.
   这个治愈的秘密被大家保密了。
2. 2. He hid his true feelings behind a mask of politeness.
   他把自己的真实感受藏在礼貌的面具后面。
3. 3. The truth is too sensitive to be kept a secret any longer.
   这个事实太敏感，不能再保密了。