Undiscoverable
a. 无法发现(或发觉)的, 不能公诸于世的
🗣️ 情景例句
A rolling stone gathers no moss.
滚石不生苔，转业不聚财。
The old lady takes delight in visits from her grandchildren.
那个老妇人以孙辈门看她来为乐。
I don't think this is a standard size.
我看这不是标准尺寸吧？