back stopping

 
  • 上向梯段回采
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back stopping的英文翻譯是什么意思,詞典釋義與在線(xiàn)翻譯:

英英釋義

名詞 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

back stopping的相關(guān)資料:

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