This story about thirty years ago.
这个故事发生在大约三十年前。
Dr Martin Luther King's murder took place about thirty years ago.
马丁·路德·金博士遇害于大约三十年前。
In towns, there were very few bus shelters until about thirty years ago.
三十多年前的城镇里没有太多的汽车候车亭。
That was in about 1972, thirty years ago.
那大约是在1972年，30年前发生的事了。
That was in about 1972, thirty years ago.
那大约是在1972年，30年前发生的事了。
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