I arrive at the hospital at eight o 'clock, but I don't go on duty until nine.
我八点钟就到医院了，但是九点钟我才去值班。
We start at nine o 'clock from school. When we arrive there, we begin to do work as the plan.
我们九点钟在学校开始出发。当我们到达那里的时候，我们就按照计划开始工作。
I'll arrive at the bus stop at nine o 'clock.
我将于九点钟到达汽车站。
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