The JoinRowSetImpl class had a bug in it at the time of this article?s writing that rendered the ability to specify multiple columns for the MatchColumn as useless.

在本文编写之际，JoinRowSetImpl 类有一个 bug，它允许指定多个列作为无用的 MatchColumn。

youdao

He added that the U. S. still has the illusion that it can intimidate China with military threat, but in fact, such an approach is "completely useless".

尹卓还表示，美国在南海仍幻想利用军事威胁的方式影响中国，但事实上这种行为对中国“一点作用没有”。

youdao

S obs. Now it is crying because it spend thousands of years thinking it was completely useless, and wasted all this time blaspheming God and its destiny.

现在是哭，因为它要花几千年来的思想是完全没用，浪费时间，这一切，亵渎上帝和自己的命运。

youdao

If you just scramble a sentence, it's pretty useless because the recipients are never going to be able to reverse the process.

如果你只是加密一个句子，这是毫无用处的,因为收件人没法将这个句子,反加密出来。

哈佛公开课 - 计算机科学课程节选

So it's almost as if functions really are useless because they have no ultimate effect.

所以几乎是函数是没起作用的,因为它们没有最终的效果。

哈佛公开课 - 计算机科学课程节选

It's missing all this stuff, so it must be useless.

它忽略了这么多东西,所以这个模型没有任何意义

耶鲁公开课 - 博弈论课程节选

"I intentionally abandoned the hard stuff early on because not only do I think it's useless, I think it's a distraction, " he says.

FORBES: Marketing

Older farmers who remember that crisis and see the big swarms nowadays "stop farming, because they know that it's useless, " said Huynh, the FAO's emergency and rehabilitation coordinator in Madagascar.

CNN: Plague of locusts infests impoverished Madagascar

That also means it's pretty useless if you only want to schlep one bag around, so it looks like we're stuck with the Bucket Dance for now -- hey TSA, would pockets on the sides be such a threat to our nation's security?

ENGADGET: Skooba makes with the pictures of TSA-friendly bags (update: not really)