s. designed to elude detection
s. difficult to find
a. 隐藏的
hide的过去分词
[计] 隐藏的
1. The treasure was hidden under the old tree.
宝藏藏在老树下。
2. She found a hidden message in the book.
她在书中发现了一条隐藏的信息。
3. There are many hidden dangers in the forest.
森林中有许多隐藏的危险。