closely guarded
adjective phrase1 コロケーション平均頻度: 8.5
厳重に守られた秘密
Used to describe a secret that is kept very securely and is known by very few people.
非常に注意深く守られている秘密
厳重に守られた秘密
Used to describe a secret that is kept very securely and is known by very few people.
非常に注意深く守られている秘密