Undiscoverable
a. 无法发现(或发觉)的, 不能公诸于世的
🗣️ 情景例句
It will take a few years for the region to recover economically.
这个地区的经济恢复得花几年的时间。
Experience teaches.
经验给人教训。
Was all the material in that case destroyed?
箱里的东西都毁了吗？