今日閱讀：

②The city at one time must have been prosperous, for it enjoyed a high level of civilization. Houses -- often three storeys high -- were built of stone. They had large rooms with beautifully decorated walls. ③The city was equipped with a drainage system, for a great many clay pipes were found beneath the narrow streets.

節選《新概念英語3 An unknown goddess》

【生詞】

prosperous adj.繁榮的

storey n.樓層

昨日複習提要：

昨天學習了主要學習了兩點， ①some time, sometime, sometimes的不同,尤其是當sometime做形容詞表示“以前的”時，大家都不太熟悉這個用法。②discovery表示發現，有時候也作發現物講，常與make連用。

昨天文章如下：

at a time與at one time意思截然不同，one，ones，once的區別？

今日文章解讀：

The city at one time must have been prosperous, for it enjoyed a high level of civilization. Houses -- often three storeys high -- were built of stone. They had large rooms with beautifully decorated walls.

這座古城肯定一度很繁榮，因為它曾享有高度的文明，房子一般有3層樓高，用石塊修建。裡面房間很大，牆壁裝飾華麗。

（1）at one time的含義詳解

at one time的意思是“一度”“曾經”，這是一個常用搭配，需要注意的是，如果把one換成a，雖然都是表示“一個”，但是含義是不同的。

①at a time的意思是“每次”或“一次”，比如：

Focus on one subject at a time.

每次集中精力在一件事情上。

②at one time表示“曾經”，“曾經”這個詞在中文裡就能看出其使用的場合應該是表示過去，所以當at one time出現時，句子應該是過去時。比如：The song had a great vogue at one time. 這首歌曾風行一時。

③同樣表示“曾經”含義的單詞once

I once went there with my brother.

我曾經同我弟弟去過那裡。

雖然注意區別在於，once表示曾經時，詞性為副詞，用來修飾動詞。而at one time是介詞短語，位置相對較自由。

④one與ones

與once發音相似的ones，可以作代詞來表示單數名詞的複數。比如：

There were a number of well-known scientists in the last century, but Albert Einstein was one of the more interesting ones. 上世紀有許多著名科學家，但是愛因斯坦是其中較為有影響的一個。

在這個句子中ones就是來指代前面提到的scientists，因為是複數，所以原來由one來指代單數的情況下多了s。