Are the inferences valid? Does the conclusion follow the premises?

推断有吗？结论与前提一致吗？

A student passport is valid in accordance with the length of their programmes.

学生护照的有期与他们的学时一致。

So are travelers who already have valid visas.

持有签证证件者也可以入境。

This is a hop-on hop-off service and tickets are valid for 24hours.

这是一种随上随下服务，车票24小时有。

All the reasons it was popular in the past are just as valid today.

它在过去流行的所有原因在今天同样有。

I think you both make valid points.

我觉得们两个说的都有道理。

The evidence had to be economic in order to be valid.

证据必须是有经，才能站得住脚。

I think that is very, very valid.

我认为这话非常非常有道理。

Socrates was concerned with finding clear and universally valid definitions of right and wrong.

苏格拉底想为是非对错找出一个清楚明白，而且放诸四海皆准的定义。

Certainly, there are valid concerns about the patchwork regulations that could result if every state sets its own rules.

当然，假如各州都设立自己的法规，“补丁法规”的担忧也是合理的。

No matter where you are from, your dreams are valid.

无论来自哪里，的梦想都会得到尊重。

And that makes a statement that perhaps all levels of reality are equally valid.

这表明也许所有层面的现实都同样有。

The Special tickets are also valid for travel at weekends.

这种特殊票在周末出行也有。

Then there's the Special ticket, which is valid for travel after 10.15.

之后还有一种特殊票，它在10: 15以后出行才有。

In many countries, a driving license is a valid proof of identity.

驾驶执照在很多国家是有的身份证明。

B) It is what proves valid and true to life.

C）科学可以证明有和真实的生活。

To be valid, thirty percent of Romania's 18.7 million registered voters need to take part.

要想使公投有，那么罗马尼亚1870万注册选民中需要有30%的人参加投票。

And that is a valid question to be asking.

这是一个合理的问题。

But to this day, there are still scientists who maintain that initial analysis was valid.

但是直到今日，仍然有科学家认为那些最初的分析是有的。

Yet, there are valid reasons boredom may feel so painful.

不过，无聊也确实可能令人痛苦。