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问题: 为什么这里可以用a而不用the ?

When the price of train went up a third time in one year ,I decided to buy a motorcycle to ride to work .

解答:

When the price of train went up a third time in one year ,I decided to buy a motorcycle to ride to work .

当铁路票价在一年内再一次上涨时,我决定买一辆摩托车上班。

a+序数词:表示“又、再”之意。
the+序数词:表示“第…次”之意。