He has a curious habit of scratching his ear while he speaks.是什么意思？

He has a curious habit of scratching his ear while he speaks.

他有一种奇怪的习惯, 一讲话就搔耳朵。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

has

v. 有( have的第三人称单数 )，（亲属关系中）接受，拿，买到；

例句
...the operation a patient has had.
病人做过的手术

curious

adj. 好奇的， 好求知的，奇妙的， 稀奇的；

例句
Steve was intensely curious about the world I came from...
史蒂夫非常想了解我以前生活的那个世界。

habit

n. 习惯，习性，气质，宗教服装；vt. 给…穿衣服，打扮；

例句
The professor hoped to break the students of the habit of looking for easy answers.
教授希望改掉学生们不动脑筋就想找到答案的习惯。

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。

scratching

刮痕；

例句
The couple set up a 24-hour security camera to trap the vandal scratching their car.
夫妇俩装了个 24 小时监控摄像头，想要抓住故意划坏他们车子的家伙。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

ear

n. 耳朵，听觉，听力，耳状物，穗；vi. 抽穗，（美俚）听见；

例句
It sounds like an advert: easy on the ear but bland and forgettable.
这听起来像广告词：听着简单易懂，但是枯燥乏味，容易忘记。

while

conj. 在…期间，与…同时，虽然，

例句
A Dr Matthew Owens was reported missing while on an expedition to north-eastern Turkey.
据报道，一位叫马修·欧文斯的博士在前往土耳其东北部考察的途中失踪了。

speaks

v. 讲，谈( speak的第三人称单数 )，说，演说，从某种观点来说；

例句
He speaks in a melodious baritone.
他的声音浑厚而有磁性。