Undiscoverable
a. 无法发现(或发觉)的, 不能公诸于世的
🗣️ 情景例句
Sure. We've been in business about five years now.
当然。我们创业至今有五年的历史。
Oh, it's a shame that you have to leave.
哦，真遗憾，你非走不可呀。
CUSTOMS OFFICER: Are you Swedish?
你们是瑞典人吗？