1、Study on the Sensitivity in Detecting Crab Nebula by ARGO-YBJ Experiment
羊八井ARGO實驗對Crab源靈敏度的研究

2、The Crab Nebula is at a distance from us of about 5,000 light-years.
蟹狀星云距離我們，大概是5000光年。

3、The Crab Nebula spans about 10 light-years.
蟹狀星云的大小約有10光年。

4、We have identified the crab nebula as the debris of this explosion.
我們已證明蟹狀星云就是這次 * 的遺跡。

5、For example, Messier object M1 is the CRAB NEBULA and M31 is the ANDROMEDA GALAXY.
例如，梅西耶天體m 1是蟹狀星云，而M31是仙女座星系。