O is for observation; observation is the best teacher. O.

代表观察。观察是最好的老师。

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Astronomers o are involved in the observation, analysis and research of various astronomical phenomena, such as the movements of celestial bodies like moons, planets, stars and galaxies.

天文学家的工作涉及到观察、分析以及研究各种各样的天文现象，比如月亮、行星、恒星、银河等天体的运动。

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A particularly striking observation was that in patients not in group o, massive transfusions of o blood resulted in the virtual replacement of the recipient's cells by cells of the o group.

一项特别的引人注目的观察是，在非o型血病人中，大量的输o型血会导致一系列的O型血细胞对病人细胞虚拟的替代。

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