콤마는 뒤에 절이랑 구분해 주려고 그냥 쓴 거에요~ office clerks suggested / an increasing level of insulation within the building / because / without enough insulation, / heat easily passes through the glass windows and walls 이렇게 되는데 without enough insulation을 문장 뒤로 보내서 해석하면 더 쉽겠네요 ㅎ
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