1.noon的意思是指正午十二点钟,不指一段时间。noon前无冠词。
2.用in the noon表示“晌午”前后一段时间,为非正式用法。

morning, noon and night
日日夜夜 all and every day and night
The lights went on morning, noon and night and it was really a waste.电灯白天黑夜都亮着,这真是一种浪费。
He carefully attended to the wounded soldiers morning, noon and night.他日夜仔细照料伤员。
She worked morning, noon and night for the children, forgetting herself.她日夜为孩子们操劳,一点也没想到自己。

It approached noon.时已正午。
The Prime Minister is scheduled to arrive at noon.首相定于中午到达。
The rocket is due to lift off at noon on Friday.火箭定于星期五中午发射。
The marines landed at noon.海军陆战队在中午登陆。
The judge handed his decision down at noon.法官中午下了判决。
The goods will be delivered at noon tomorrow.明天中午交货。
Can you guarantee to get these before noon?你能保证在中午之前弄到这些吗?
By noon, all 61 people were judged out of danger.到中午时,61个人看来都脱离危险了。

我们打算在中午离开。
［误］  We propose leaving during the noon.
［正］  We propose leaving at noon.
［析］  noon不指一段时间,一般也不加冠词。

［同义词］   midday
［反义词］   midnight
［词源］  ＜拉丁语nona(中午)