观测时间
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observing-time period
观测时间周期
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It started in 2010 and was granted a total of 1929 hours of observing time over a five-year period.
ENGADGET: 9-gigapixel image of the Milky Way reminds us just how small we truly are
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