为什么同样是同位语从句，一个用a，一个用the呢。

1：

The fact Liberia has no oil seems to explain foreign disinterest in its internal affairs

2：

They are unaware of a simple but important fact that memory can be developed. If you will just accept that fact, this book will show you how.

The fact Liberia has no oil seems to explain foreign disinterest in its internal affairs

定冠词表示特指，意味着这是唯一的事实，没有其它的了。唯一的就是特指的。

They are unaware of a simple but important fact that memory can be developed. If you will just accept that fact, this book will show you how.

不定冠词表示泛指，单数名词泛指表示不确定的一个，意味着关于记忆还有其它的事实。这里谈论的只是其中之一而已。

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擅长：动词用法,句法问题 | 采纳率 82% | 回答于 1秒前

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陈才 - 英语教师 1秒前

擅长：中考英语,词法问题

(1)The fact Liberia has no oil seems to explain foreign disinterest in its internal affairs

解答：用定冠词the表示特指.后面同位语从句表示特指意义，表示某个具体特定的事实。

They are unaware of a simple but important fact that memory can be developed. If you will just accept that fact, this book will show you how.

解答：用不定冠词a表示泛指指.后面同位从句表示泛指意义。