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天底点 tiāndǐdiǎn
rem.sens. nadir; nadir point; plumb point; photograph nadir
tech. map plumb point; plate nadir point; plate plumb point; vertical point
天底点【天文】 tiāndǐdiǎn
el. nadir
天 底点
: 22 phrases in 4 subjects
Aviation1
Oil / petroleum4
Space5
Technology12