snow groomer       
noun [ C ] uk/ˈsnəʊ ˌɡruː.mər/ us/ˈsnoʊ ˌɡruː.mɚ/
 (雪场用来平整雪道的)压雪机,推雪机
a large vehicle used on ski slopes to make the snow smooth and ready for skiing on
  The company is a producer of snow groomers for winter sports resorts. 该公司生产冬季运动度假村用压雪机。 
 The caterpillar-tracked snow groomer is designed to flatten snow for smooth skiing.  毛毛虫履带式压雪机的设计目的是平整雪地,让滑雪更加流畅。 
 Synonyms: grooming machinepiste basher
 - More examples
 - One mud flow temporarily trapped a snow groomer at a ski area.
 - Semitrailers haul in snow groomers flown in from abroad.
 - There are snow sculptures, ice carvings, and snow groomer rides.