hidden

动词 hide:

1. prevent from being seen or discovered
   同义词：hide, conceal
2. be or go into hiding; keep out of sight, as for protection and safety
   同义词：hide, hide out
3. cover as if with a shroud
   同义词：shroud, enshroud, hide, cover
4. make undecipherable or imperceptible by obscuring or concealing
   同义词：obscure, blot out, obliterate, veil, hide

形容词 hidden:

1. not accessible to view
   同义词：concealed, out of sight
2. designed to elude detection
   同义词：secret
3. difficult to find
   同义词：obscure

1. He whistled to his friend to keep hidden.
   他吹口哨通知朋友继续隐蔽。
2. The castle was hidden behind a curtain of smoke.
   城堡被一层烟雾遮掩着。
3. The valley was hidden from view in the mist.
   溪谷隐没在雾霭之中，看不见了。
4. Navigation is difficult on this river because of the hidden rocks.
   因为河上有暗礁，所以在这条河上航行很困难。
5. The policeman frisked him for hidden weapons.
   警察向他搜身，以确定有无隐藏武器。
6. The soldiers were warned to remain hidden and not to expose themselves.
   士兵们受到警告要隐藏好，不能暴露自己招致危险。
7. An embassy that was compromised by hidden listening devices.
   因隐藏着窃听器而处于险境的大使馆
8. The Customs have found heroin hidden in freight.
   海关查出了隐藏在货物中的海洛因。

hid.den

v.（动词）
A past participle of hide
hide的过去分词