请教:这些都指的是单板里的什么运动?

瓢虫

看到一篇文献,讲单板的,下面的这些不明白具体怎么翻译,请教各位.谢谢 ……snowboarding on a mental tube called a rail or over a box-type obstacle called a box are conducted, as well as a half pipe or jump in snowboarding.
另外，stance width指单板里的什么呢？