Sunspots are dark patches marking magnetically active regions that often host solar flares and violent belches called coronal mass ejections.
黑子是太阳表面比较暗的区域，也叫活动区。那里经常发生耀斑和日冕物质抛射等剧烈的喷发现象。
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This was based on the assumption that SMBHs form in a similar way to stellar-mass black holes, marking the final phase in the lifespan of massive stars that have exhausted all their fuel for fusion.
Palestinian youths take part in a bicycle rally in the West Bank city of Jenin yesterday, marking the anniversary of the mass displacement of Palestinians surrounding Israel's establishment in 1948.