uniform:the special set of clothes worn by all members of an organization or a group at work, or by children at school 制服;校服
a military/police/nurse's uniform
军装;警服;护士制服
soldiers/sailors in uniform
穿制服的士兵/水手
The hat is part of the school uniform.
帽子是校服的一部份.
elementary school:小学
boarding school:寄宿学校