Where does this definition of 威利斯垂直距离测量尺 come from?
This entry for 威利斯垂直距离测量尺 is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
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.