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与"plain spark-gap"相近的词条

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• plain sailing
• plain scan
• plain siffing posture
• plain sitting posture
• plain skull x-ray
• plain spark-gap
• plain spinal roentgenography
• plain-spoken
• plain spring headframe
• plain spring stethoscope
• plain stage
• plain tablets
• plain taste
• plain tea and simple food
• plain text messages typing
• plain tomogram

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