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to look out over; to survey (scene); to take an extensive view of
屋上から街を見わたすと灯りが輝いていた。
Looking out over the city from the rooftop, the lights were shining.
田園を見わたすかぎり稲穂が揺れていた。
As far as the eye could see, rice stalks swayed across the fields.
会場を見わたしたが彼の姿はなかった。
I surveyed the venue but could not find him.