Mr Clark underwent five hours of emergency surgery.是什么意思？

Mr Clark underwent five hours of emergency surgery.

克拉克先生经受了 5 个小时的外科急救手术。

Mr

abbr. Mister 先生，Master 少爷，Mother 母亲，molecular radius 分子半径；

例句
According to police accounts, Mr and Mrs Hunt were found dead on the floor of their kitchen.
据警方称，亨特夫妇被发现死在家里厨房的地板上。

Clark

abbr. combat launch and recovery kit 战斗开始与防御装备；

例句
...an autographed photo of Clark Gable.
克拉克·盖博的签名照片

underwent

v. 经历，承受( undergo的过去式 )；

例句
Only 12 weeks ago he underwent major heart transplant surgery...
12个星期前他才刚刚接受了风险很高的心脏移植手术。

five

num. 五，五个，与某人击掌问候（或庆祝胜利），第五；n. 五，五个，5美元钞票，[板]得五分；adj. 五的，五个的；

例句
I'm just checking up on Kim. It'll take me all of five minutes.
我只是要督促一下金，总共也就需要5分钟。

hours

n. 小时( hour的名词复数 )，固定时间，一小时的时间或行程，重要时刻；

例句
The workforce have recently been calling for their working hours to be reduced. Many companies have accordingly switched to a five-day week.
工人们最近一直在呼吁缩短工作时间。许多公司于是转成了一周五天工作制。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

emergency

n. 紧急情况，突发事件，非常时刻；adj. 紧急的，应急的；

例句
The government is taking emergency action to deal with a housing crisis...
政府正采取紧急措施解决住房危机。

surgery

n. 外科学，外科手术，手术室，诊所，诊断时间；

例句
For many, the dentist's surgery remains a torture chamber.
对许多人来说，牙医的治疗室一直是间受刑室。