For... fixed step speed是什么意思？

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• 纪念品英语
• narrow
• passage
• profile
• scared
• pear
• aspect
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• autumn
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• tomato
• approaches
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• giraffe
• begins
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• PEGGING
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• Ann asked the fox
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• spurting
• monetary equivalent
• shoulder girdle
• zymoid
• a fat lot
• lespidin
• commixes
• have a miscarriage
• miracle drug
• back plate
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• unlovely
• sarcolemma
• locally grown goods
• chance upon