?炉额    mantel piece

?手册    manual

?手动警报系统,人工警报系统    manual alarm system

?手动控制,人工控制    manual control

?手动控制站,人工控制站    manual control station

?手动切割    manual cutting

?人工操纵    manual handling

?人工排料    manual nest

?手操作,人工操作    manual operation

?手动泵    manual pump (or hand pump)

?人工焊接    manual welding

?麻时效钢    maraging steel

?马可尼天线    Marconi antenna

?单桅船    Marconi rigged cat

?双桅船    Marconi rigged ketch

?多帆单桅小船    Marconi rigged sloop

?纵帆快艇    Marconi rigged yawl

?边缘,余裕    margin

?边缘板(木甲板)    margin (or boundary) plank

?边际线    margin line

?安全边界    margin of safety

?边缘板    margin plate

?余裕厚度    margin thickness

?裕度    margine (or allowance)

?船舶,海运,船用    marine

?海洋大气    marine atmosphere

?船用锅炉    marine boiler

?船用煤    marine coal

?船用柴油,柴油    marine diesel oil

?船用引擎    marine engine

?轮机    marine engine

?轮机员,轮机工程师    marine engineer

?船用检流计    marine galvanometer

?船用胶    marine glue

?海生物防附装置    marine growth preventing system (MGPS)

?海洋污染    marine pollution

?船台[滑道]    marine railway

?海洋牧场    marine ranching

?海洋研究船    marine research ship

?海洋资源    marine resources

?船用卫生设施    marine sanitation device (MSD)

?船用涡轮机    marine turbine