back stopping

英 美
  • 上向梯段回采
  • back n.后面;背脊;靠背;后背;后卫vt.支持;后退adv.向后地adj.向后的;后面的;偏远的;过时的;积欠的
  • stopping n.停止;填塞物动词stop的现在分词形式.
名词 backstop:
  1. (baseball) the person who plays the position of catcher

  2. (baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field

  3. a precaution in case of an emergency