The via subelement of the rev element contains an empty value.

rev元素的via子元素包含一个空值。

youdao

An empty value for user name and a non-empty value for password.

用户名为空，密码不为空。

youdao

A non-empty value for user name and an empty value for password.

用户名不为空，密码为空。

youdao

I'll compute its value. Then I'll empty the backpack out, put another combination of stuff compute its value, try all possible ways of filling up the backpack, and then when I'm done, I'll know which was the best.

直至把它填满，然后计算价值,然后我把包里的东西都导出来,再换一堆东西计算它们的价值,尝试过所有填满包的方案后,我就知道哪一种方案是最好的了。

麻省理工公开课 - 计算机科学及编程导论课程节选

Police Chief Dean Esserman of Providence, Rhode Island, said that for a time, his department saw a dramatic increase in copper thefts resulting from empty, foreclosed homes and the increased value of copper on the commodities market.

CNN: Neighborhood watches are on the front lines in bad economy

The rich buy apartments and often leave them empty, treating them as a store of value.

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He said properties left empty for a long time often attracted "vandalism and fly tipping and drag down the value of the properties all around them".

BBC: Derelict house