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sunspot
释义
sunspot
日斑黑子
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beam diameter
beam diaphragm
beam direction
beam directionality
beam directional stability
beam displacement
beam divergence
beam divergence angle
beam diverging
beam diversity
beam divider
beam doffer
beam dosimetry
beam drill
beam droop
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beam-dump magnet
beam duty cycle
beam dyeing machine
beamed rediation
beam effect
beam efficiency
beam-emergence direction
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