以下为句子列表：
英文: LIGO started collecting data in 2003. The observatory is the largest, most sensitive gravitational wave detector ever built. A planned series of upgrades will increase LIGO's sensitivity even more.
中文: LIGO从2003年开始收集数据。它是目前全世界最大的、灵敏度最高的引力波探测所。一系列的升级计划将更进一步提高其灵敏度。
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