单词：open cluster
open cluster的用法和样例：
例句
- The Pleiades nebulosity is caused by a chance encounter between an open cluster of stars and a molecular cloud.昴星团是在一次偶然的机会下，由一个疏散星团与一个分子星云遭遇而形成的。
- In this scenario, the cluster stars drift off as other stars in the galaxy gravitationally tug on them.在星系其他恒星的重力吸引下，疏散星团会逐渐散开，被其他恒星吞噬。
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