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boardsailing; windsurfingnoun
は
topic markergrammar
風の強い
windy; windswept; blowyexpression, i-adjective
日
day; days; sun; sunshine; sunlight; daytime; daylight; date; deadline; past days; time (of one's childhood, etc.); case (esp. unfortunate); eventnoun
に
direction, time, indirect object, or target markergrammar
最適
optimal; best; most suitablena-adjective, noun
だ。
plain copulagrammar