that clean corridors
干净的走廊
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It is imperative that common areas such as sidewalks, pavements, corridors (in apartments), and steps be kept clean at all times.
必须时刻保持公共区域，比如步道、走廊(公寓里)和台阶干净卫生。
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