- A motorbike or bicycle designed for use on rough surfaces, such as dirt roads or trails.泥土路摩托车：设计用来在粗糙路上行驶的摩托车或自行车，如泥土路或小径上
- mastectomies
- mastectomy
- masted
- master
- master-at-arms
- master bedroom
- master chief petty officer
- master class
- mastered
- masterful
- master gunnery sergeant
- masteries
- mastering
- master key
- masterly
- master mariner
- master mason
- mastermind
- master of ceremonies
- masterpiece
- masterpiece
- master plan
- master race
- masters
- Masters