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Sentence
Span Details
順行運動
direct motion; prograde motionnoun
と
quotation, conditional, companion, or and markergrammar
逆行運動
retrograde motion; apparent retrograde motion; retrogradationnoun
は、
topic markergrammar
天文学
astronomynoun
の
possession, attribution, nominalizer, or nominal linkergrammar
基本的
fundamental; basicna-adjective
な
adnominal form of the copula after a na-adjectivegrammar
概念
concept; notion; general ideanoun
だ。
plain copulagrammar