The existence of black holes in the universe is well supported by astronomical observation, particularly from studying supernovae and X-ray emissions from active galactic nuclei.
天文学观察很好地支持了宇宙中黑洞存在，特别从研究来自活跃的银河核心超新星和X光辐射。
The samples were observed with X ray, gross and histology observation methods.
对标本进行X射线摄片、大体和组织学观察。
Combining the computer simulation with X-ray real time observation, view-cast is a novel technique used for optimizing design of filling system.
它是指将计算机模拟与X射线实时观察相结合，进行铸件浇注系统优化设计的新技术。
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