apparatus

1. equipment, 设备, 仪器; 装置
2. machinery, 组织, 机构

牛津词典说apparatus有器官的意思，the respiratory apparatus=呼吸器官。LDOCE和柯林斯无此义项。The respiratory system (also respiratory apparatus, ventilatory system) is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. 我觉得respiratory apparatus可译为"呼吸系统"，取"组织, 机构"意。

Firefighting is a field that requires the use of many types of tools and equipment. Firefighters use various types of fire apparatus equipment, including ladders and a hydraulic [液压驱动] platform. A fire engine (also known in some places as a fire truck or fire lorry) is a road vehicle (usually a truck) that functions as a firefighting apparatus. 另有一说：A firefighting apparatus describes any vehicle that has been customized for use during firefighting operations. These vehicles are highly customized depending on their needs and the duty they will be performing.

和平年代牺牲人数最多的职业，是这一抹"火焰蓝": 十余年来，中国消防救援人员牺牲人数已超300人，2015年天津爆炸、2019年四川凉山木里县森林火灾，单次事故牺牲的消防员就高达数十至上百人 [澎湃]。见过一个SB把没熄灭的烟头扔到公交加气站附近！

消防知识科普 (119.gov.cn) 

2018年10月9日，公安消防部队正式移交应急管理部，在中国实行了53年的消防现役成为历史，消防队伍将作为应急管理部的应急骨干力量继续肩负使命。消防救援机构具有相对较强的独立性。在新修订的消防法中，多处独立出现“消防救援机构”，与公安、应急、工商、质监等部门并列；在国家部委等发文中，也将省级以下应急管理部门与消防救援总队等并列。The point: 不要以为消防就不能kick sb's ass了。

An appliance is a device or machine in your home that you use to do a job such as cleaning or cooking. Appliances are often electrical. So 家电 it is.

A small appliance, also called a small domestic appliance or small electric, is a portable or semi-portable machine, generally used on a table top, counter top, or other platform, to accomplish a household task. 可译为"小家电"。剃须刀属于个人卫生产品。