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單元4：Tricky Words（容易混淆的字詞）
around vs. round
"around"，該物體移動是「不規則」的。
例：Children tend to run around at school.
例：We drove around looking for a hotel.
"round"，該物體是以「繞圓」的狀態移動。
例：The athlete ran round the track.
例：The bird flew round and round the room, unable to escape.◇
