慢速英语:Circular Thinking: Round Barns on US Farms

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not longer than类似于Not more than,no more than的用法

no more than =only只有，仅仅，只不过

There are no more than a hundred people in the hall.大厅里只有100人。

not more than=at the most不超过，至多

There are not more than a hundred people in the hall.大厅里至多100人。

2.But the idea did not become popular until years later.

not until直到……才

例句：We were warned not to leave our shelter until tomorrow.
      我们收到警告明天之前不要离开庇护所。

当Not until位于句首时,句子要倒装。其结构为:Not until+从句/表时间的词+助动词+(主句)主语+谓语+...。如:

　　①Not until the teacher came in did the students stop talking.直到老师进来学生们才停止讲话。

　　②Not until next week will the sports meet be held.直到下周才开运动会。

not until的强调结构为:It is / was not until+从句/表时间的词+that+...。上面两句改为强调句为:

　　③It was not until the teacher came in that the students stopped talking.

　　④It is not until next week that the sports meet will be held.

3.A farmer could save on wood or stone with a round design that needed less material than traditional barns.

save on节省

例句：Living there will save on fuel.
       住在那可节省燃料费。
 
4.Money from their book sales helps them take care of their own barn -- a big one nearly a century old, made of concrete and wood.

take care of照顾

例句：They appointed her to take care of that old man.
      他们委派她照顾那位老人。

对付, 处理

例句：He was criticized for his delay in taking care of the matter.
      他由于没有及时处理这件事而受到批评。

a big one nearly……对前面说的barn进行描述和补充性说明。