美 [wɪˈðaʊt ˈriːzn]
无缘无故：没有理由地做某事。
No one, he submits, could have written it without possessing some power of reasoning.
他认为，如果不具备一定的推理能力，没有人能够写出这样的作品。
This seems like strange reasoning to me, as relationships are hard enough even without a 3000-mile gap between you.
这个推理对我来说似乎很奇怪，因为即使你们之间没有3000英里的距离，恋爱也非常困难。
Without careful reasoning we often get them wrong, probably because our brains use two different systems to process information (see New Scientist, 30 August 2008, p 34).
我们常常不经仔细推理就给出错误的答案，这可能是因为大脑使用两个不同的系统来处理信息（见New Scientist 30 August 2008 p34）。
If stocks are chosen by networks and without sound reasoning, then a disservice has taken place.
FORBES: Networking, Education, Conspiracy Theories and Social Responsible Investing
Traders simply couldn't have piled on the stock with such effect without it, the reasoning goes.
Their reasoning is that without language, the child would never be able to communicate with the world, but I strongly disagree.