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Sentence
Span Details
山岳地帯
mountain district; mountainous regionnoun
で
location, means, or scope markergrammar
の
possession, attribution, nominalizer, or nominal linkergrammar
救助活動
rescue operation; rescue work; aid operationnoun
は
topic markergrammar
困難を極めた。
be extremely difficult; present a major challenge-> 困難を極めるexpression, verb