Where does this definition of observation hole come from?
This entry for observation hole is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Does observation hole appear elsewhere on Lughet?
Yes — observation hole appears under other sources or language pairs in Lughet's collection. See the list below.
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.
