850年是一个历史纪年。850年，唐宣宗元圣至明成武献文睿智章仁神聪懿道大孝皇帝大中四年
原声例句
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One-third of every steamboat built in the United States before 1850 exploded and destroyed became a wreck.
850年以前,美国制造的每三艘蒸汽船,就有一艘爆炸或毁坏,彻底地报销
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And then third year when I taught it which was the last time, I had 850 students in the class, making it at that point the largest course at Harvard.
到了第三年，也就是上一次开课，有850人参加，是当时哈佛人数最多的课程。
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