保持机器及其环境的干净、整洁和安全(环境卫生)。
Keep the machines and environment in clean, tidy and safety condition (Housekeeping).
留学生有责任保持房间和周围环境的卫生。
It is the students' responsibility to keep their rooms and their surroundings clean.
留学生有责任保持房间和周围环境的卫生。
It is the students' responsibility to keep their rooms and their surroundings clean.
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