- A severe windstorm that sweeps clouds of dust across an extensive area, especially in an arid region.尘暴：一种能在很大范围内卷起大量尘云的严重大风暴，尤指发生于干燥地区的
- unimpeachable
- unimportant
- unimproved
- uninformative
- uninformed
- uninhabitable
- uninhabited
- uninhibited
- uninitiate
- uninitiated
- uninspired
- uninstall
- uninstructed
- uninsurable
- uninsured
- unintelligent
- unintelligible
- unintended
- unintentional
- uninterest
- uninterested
- uninteresting
- uninuclear
- uninucleate
- uninvited