Could you explain your reasons for choosing this particular course? 你能解释一下选择这门课程的原因吗？

The reason why so many people caught the disease is still not clear. 如此多的人患了这种病，其原因还不清楚。

The reason these cars are so expensive is that they are largely built by hand. 这些汽车如此昂贵的原因是由于它们大部分是由手工制作的。

The woman cannot be named for legal reasons. 由于法律上的原因，不能公布这名妇女的名字。

Our application was rejected, but the council gave no reason for its decision. 我们的申请被拒绝，但委员会没有说明这样决定的理由。

We can't take you all, for the simple reason that there isn't enough room in the car. 我们不能把你们全部带上，原因很简单，车内没有足够的地方。

Is there any reason to believe that she isn't telling the truth? 有理由相信她没有说真话吗？

There was every reason to expect that he would agree. 有充分的理由期望他会同意。

He has refused to pay, not without reason. 他拒绝付款并不是没有理由的。

She has no reason to shout at you. 她没有理由对你大喊大叫。

I can't see any reason for refusing their invitation. 我没有任何理由拒绝他们的邀请。

What excuse did they give for the delay? 他们对这次延误有什么说法？

Joe was late, but as always he had an excuse. 乔迟到了，但与平时一样，他还是有借口。

He made some excuse about having a lot of work to do. 他借口说有许多工作要做。

Emily was glad of an excuse to change the subject. 埃米莉很高兴能有个借口转换话题。

The doctor's report on the biopsy states that there is no cause for concern. 医生的活组织检查报告指出没有什么好担心的。

He wouldn't have done it without good cause (=a good reason). 他不可能无缘无故就这样做的。

The motive for the attack is still unknown. 袭击的动机仍然不明。

He visited her on the pretext of borrowing a book. 他以借书为托词去拜访她。

A slight fall in profits gave the management a pretext to get rid of some older members of staff. 利润略微下挫就给了管理层一个借口来裁掉一些老员工。

He believes he has reasonable grounds for making the demand. 他相信自己有充分的理由提出要求。

The Act prohibits discrimination on the grounds of sex or marital status. 该法案禁止基于性别或婚姻状况的歧视。

The army turned him down on medical grounds. 由于健康原因，部队没有招收他入伍。

They oppose the bill on the grounds that it is too restrictive. 他们反对这一议案，是因为该议案限制性过强。