Objective To analyze the sanitation status of Guangzhou metro 2nd line before operation, and compare it with Guangzhou metro 1st line.
目的了解广州地铁二号线开通前卫生状况并与一号线开通前进行比较。
Objective To analyze the sanitation status of Guangzhou metro 2nd line before operation, and compare it with Guangzhou metro 1st line.
目的了解广州地铁二号线开通前卫生状况并与一号线开通前进行比较。
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