VOA慢速英语:Needle Injuries to Medical Students Often Go Unreported

not……but两者之间进行选择

注意另外一个句型：It is not that but不是因为……而是因为……

It's not that I don't like the car, but I think it is too expensive.
不是我不喜欢这辆车，而是它太贵了。

It's not that I am unwilling to help you, but I'm tied up with extra work these days.
不是我不愿意帮你，而是因为这段时间我工作太忙了。

It's not that he doesn't need your help, but he thinks it will be an inconvenience to you.
不是他不需要你帮忙，而是他怕给你带来麻烦。

2.But a recent study found that medical students often fail to report them.

fail to未能...

例句：The medicine failed to act.
       这药没起作用。

3.Yet nearly half of those whose most recent incident happened in school did not report it to an employee health office.

Yet的用法

yet用作连词时，与but一样也主要用于转折，意为“但是”“而”：

I have failed, yet I shall try again. 我失败了，但我还要尝试。

The judge was stern, yet completely fair. 法官很严峻，却完全公正。

They are the same, yet not the same. 它们又一样，又不一样。

It is strange, yet it is true. 那真是怪事，然而却是事实。

I’ve been away only for three years, yet I can hardly recognize my hometown. 我仅在外三年，可我几乎认不出我自己的故乡了。

He said he was our friend, yet he wouldn’t help us. 他说他是我们的朋友，但却不肯帮助我们。

有时用在句首。如：

Yet the house was cheerful. 但屋子里显得很欢快。

Yet its population has doubled. 但它的人口翻了一番。

yet有时可与并列连词and或but连用，构成习语and yet和but yet，且两者大致同义(均相当于表转折的but)：

I gave him ten pounds (and) yet he was not satisfied. 我给了他十镑但他仍不满足。

She’s vain and foolish, and yet people like her. 她很虚荣愚蠢，但人们却喜欢她。

She drove very fast to the airport, but [yet, and yet, but yet] she missed the plane. 她开快车去机场，可还是误了飞机。

although不能与表示转折的but连用，但是却可以与yet连用。如：

Although we have made some progress, yet we still have a long way to go. 我们虽然取得了些进步，但还是远远不够的。