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アメリカヨタカ
common nighthawk (Chordeiles minor)-> アメリカ夜鷹noun
は
topic markergrammar
夕暮れ時
time around sunset; early eveningnoun
に
direction, time, indirect object, or target markergrammar
活動
activity; action; operation; moving picture (obs. abbr.)noun, suru verb
を
object markergrammar
始める。
start; begin; commence; start up; open; establish; start to ...; begin to ...ichidan verb, auxiliary