backstop是什么意思？

• 导师英文
• 分配英文
• cheese
• saturday
• crayon
• failure
• 缺陷英文
• polite
• 权限英文
• reveal
• lycopene
• repeat
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• 参数英文
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• 队长的英文

• silver
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• PEGGING
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• banger
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• lake
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• approaches

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• move back and forth
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• revolt against
• threshing machine
• body odour
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• cyanide carburizing
• Detonating tube
• open a court session
• Leveling Machine
• ambulant clinic
• Fat land
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• even state
• correlation method
• strawboard