公用事业

例句：

1. 1.The utility of this new device is well-known to everyone.
   这个新设备的实用性众所周知。
2. 2.He decided to switch to a more energy-efficient light bulb for his home's utility needs.
   他决定更换一个更节能的灯泡来满足家庭的日常需求。
3. 3.The city has invested heavily in the development of public transportation as a way to enhance its utility.
   该城市大力投资于公共交通的发展，以增强其便利性。