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当黑子接近日面西边缘时,向中心一方的半影没有消失的趋势。
When the spot approaches the west limb, the penumbra toward the disk-center has no tendency to disappear.
youdao
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当黑子接近日面西边缘时,向中心一方的半影没有消失的趋势。
When the spot approaches the west limb, the penumbra toward the disk-center has no tendency to disappear.
youdao