Where does this definition of covering surface come from?
This entry for covering surface is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Does covering surface appear elsewhere on Lughet?
Yes — covering surface 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.