Untraceable
a. 难追踪的, 难以发现的, 难以描绘的, 难以摹写的
🗣️ 情景例句
Here's my grandfather. He lives in Florida.
这是我祖父 他住在Florida。
I asked him to clean it for me, but he wouldn't.
我请他帮我清理，但是他不肯。
Without something of this kind, searching for intelligences on other planets
没有这种手段，要想寻觅其他星球上的智力生命，