Illness is a valid excuse for being absent from work.

This train ticket is valid for three days.

这张车票3日内有效.

His excuse was not valid.

他的借口靠不住.

Is this contract valid?

这份合同有法律效力 吗 ?

This railway ticket is valid for three days.

这张火车票的有效期是三天.

This guarantee is valid for one year.

这份保证书有效期为一年.

He has a valid passport.

他的护照有效.

The coupon is not valid if detached.

这折扣券撕下即无效.

This is a valid will.

这是一份具有法律效力的遗嘱.

Please supply a valid user password.

请提供一个有效的用戶密码.

He is charged with several misdemeanour, including driving without a valid licence and creating a disturbance.

他被控告犯有好几种轻罪, 其中包括无有效驾驶执照驾驶和扰乱治安.

Do you have valid reasons for your absence?

你的缺席有正当理由 吗 ?

His claim to own the house is valid.

他主张对此屋的所有权有效.

He did not accept this reply as valid.

他认为这个回答没有根据。

A pharmacist can fill any prescription if, in his or her judgment, the prescription is valid.

只要药剂师认定处方有效就可按方配药。

He recognized the valid points that both sides were making.

他认可双方观点中的合理之处。

Fewer than forty per cent voted— the threshold for results to be valid.

投票的人不到40%——投票结果无效。

For foreign holidays you will need a valid passport.

出国度假需持有效护照。

It is valid to consider memory the oldest mental skill, from which all others derive.

我们有理由认为记忆是最原始的心智技能，所有其他技能都在此基础上衍生出来。

All tickets are valid for two months.

所有的票在两个月内有效。

Most designers share the unspoken belief that fashion is a valid form of visual art.

绝大多数设计师都默认这样一种观点，即时装是视觉艺术的一种有效形式。