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back stop的英文翻譯是什麼意思，詞典釋義與在線翻譯：
英英釋義
名詞 backstop:
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(baseball) the person who plays the position of catcher
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(baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field
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a precaution in case of an emergency
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act as a backstop
