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Sentence
Span Details
太陽電波
solar radio wavesnoun
の
possession, attribution, nominalizer, or nominal linkergrammar
観測
observation; survey; measurement; opinion; prediction; thinkingnoun, suru verb
は、
topic markergrammar
太陽活動
solar activitynoun
の
possession, attribution, nominalizer, or nominal linkergrammar
研究
research; study; investigationnoun, suru verb
に
direction, time, indirect object, or target markergrammar
欠かせない。
indispensable; essential; vital; crucialexpression, i-adjective