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球面三角法
spherical trigonometrynoun
は、
topic markergrammar
天文学
astronomynoun
や
and; such things asgrammar
測地学
geodesynoun
で
location, means, or scope markergrammar
重要
important; essential; significantna-adjective
な
adnominal form of the copula after a na-adjectivegrammar
役割を果たす。
play a role; serve a function; play a partexpression, verb