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使用者；用户
A user is a person or thing that uses something such as a place, facility, product, or machine.
例句
Beach users have complained about people walking their dogs on the sand.
海滩上的游客投诉有人在沙滩上遛狗。
...a regular user of Holland's health-care system.
经常使用荷兰医疗服务的人