Concat itself is a an extension method implemented as such.
代码中的Concat是一个扩展方法(extension method)，其实现如下。
Education (at least high school) is a an essential foundation for every single person today.
今天教育(至少高中教育)对于每个人是十分重要的基础。
A wedding is an emotionally charged situation.
婚礼是一个激动人心的场合。
This is a resurrection of an old story from the mid-70s.
这是70年代中期的一个老故事的再现。
He was also for a time an art critic.
他曾有相当长的一段时间是一位艺术评论家。
He was dressed in a suit and an impeccable white shirt.
他身穿一套礼服和一件洁白的衬衣。
Is that a criticism or just an observation?
那是一种批评呢，还是一种观察评论而已？
I hold a door open for an old person.
我替一位老人把门开开。
For a time he contemplated a career as an army medical doctor.
他曾一度考虑做一名军医。
After only a minute an authoritative voice came through the static on the radio.
过了仅一分钟后，透过广播的静电噪音传出了一个威严的声音。
A career as an actor requires one hundred per cent commitment.
干演员这一行需要百分之百的投入。
His career as a playwright had an auspicious start.
他的剧作家生涯有一个好的开头。
The kids had a ride on an elephant at the zoo.
在动物园里，孩子们骑着大象走了一圈。
It's a useful introduction to an extremely complex subject.
这是对一门极为复杂的学科的有益入门教程。
A rock is an inanimate object.
岩石是无生命的物体。
She had given the assignment an A.
她给这份作业打了个优。
He was a poet and an ardent spiritualist.
他是位诗人，也是热诚的唯灵论者。
After a bit of an argument, he stormed out.
一次小小的争吵之后，他就气冲冲地走出去。
There's a big difference between an amateur video and a slick Hollywood production.
业余录像与娴熟的好莱坞作品之间有天壤之别。
Ludo is a version of an ancient Indian racing game.
“鲁多游戏”是一种古代印度竞赛游戏的变体。
He earned a reputation as an expert on tax law.
他赢得了税法专家的美名。
You get an A grade for scores of 75 and over.
75分及75以上的分数就是优等。
We want this to be like a home, not an institution.
我们希望这里像个家，而不像收容所。
A degree is an essential prerequisite for employment at this level.
学位是做这级工作必备的先决条件。
The offending comment was in fact a heckle from an audience member.
那冒犯性的评论实际上是一名观众的起哄。
He is a political pragmatist, not an idealist.
他是个政治上的实用主义者，而不是个理想主义者。
The price of a PC has fallen by an average of 25% a year since 1982.
1982年以来个人电脑的价格平均每年下降25%。
Sheila found some work as a secretary in an insurance company.
希拉在一家保险公司找到了一份做秘书的工作。
Yesterday's vote itself was a retreat from an earlier fallback position.
昨天的投票本身就是从早先的预备立场上的退却。
There is, he said, a lack of an integrated national transportation policy.
他说目前缺乏一个整体的全国运输政策。
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