Yiyuan no. 1 High School, founded in 1956, covers an area of 489 mu. It now has 120 classes with 6720 students and 449 teachers.
沂源县第一中学创建于1956年，学校占地489亩，现有教学班120个，在校生6720人，在编教职工449人。
Located about 2,000 light years from Earth in the constellation Lyra, the Ring Nebula is also known as Messier Object 57 and NGC 6720.
这个星云位于距离地球2000光年的天琴座内，它还有另外两个名字：Messier Object 57和NGC 6720。
Located about 2, 000 light years from Earth in the constellation Lyra, the Ring Nebula is also known as Messier Object 57 and NGC 6720.
这个星云位于距离地球2000光年的天琴座内，它还有另外两个名字：Messier Object 57和NGC 6720。
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