我们认为，是A2255中子团的并合历史导致了星系团中星系与星系之间的碰撞概率增加，从而使团中心附近的晚型星系的恒星形成活动增加了。
Compared with the merging cluster A2255, the star formation history for the late-type cluster galaxies is likely closely related to the virialization stage of parent cluster.
目前大质量恒星形成的理论主要有两种，即吸积说和并合说。
There are two main theories concerning massive star formation, accretion and merger.
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