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等高圈 děnggāoquān
gen. almacantaer
avia. almucantar
construct. circle of equal altitudes
space altitude circle; circle of equal altitude; parallel of altitude; almucantar (almucantur)
tech. almacantar; almucantur; altitude parallel; equal-altitude circle
等高
tech. circle of equal altitudes
天球上等高圈 děnggāoquān
gen. altitude-circle
天体等高圈 děnggāoquān
space circle of position