sunspot [ˈsʌnspɑ:t]

例句:

• This includes the continuous survey of umbra and penumbra of the sunspot.
  这包括对太阳黑子本影和半影持续的观测.
  
• These faculae frequently are the forerunners of sunspot formation.
  这些光斑常常是形成太阳黑子的先兆.
  
• We observe three sunspot groups on the disc.
  在日面上观测到三个黑子群.
  
• Lets go with sunspot activity for this one.
  来自SA
• However, the mechanism for sunspot production has remained hidden.
  来自SA
• Diminished sunspot activity plunged the world into cold.
  来自WSJ