Daily English. 日常英语 last night.
"a" vs "the"
"a" 表达不具体的东西 比如说 I saw a movie
How was the movie?
There was a market crash last week.
The crash provided a good buying opportunity.
The buying opportunity allowed us to profit immensely.
看一看，先介绍新的topic用 "a". 后来参考这个话题用着"the"
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