A movie rating that allows admission only to persons of a certain age, usually17, unless accompanied by a parent or guardian.
R级，电影的限制级一种电影分级，允许一定年龄以下（通常为17岁）的人在家长或保护人陪同下才能观看
A guardian; a protector.
监护人；保护人
The legal guardian must act on behalf of the child.
法定监护人应该维护这个孩子的利益.
