He maintained a professional demeanour throughout.是什么意思？

He maintained a professional demeanour throughout.

他始终保持着专业人才的风度。

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。

maintained

v. 保持( maintain的过去式和过去分词 )，保养，坚持，保卫；

例句
He maintained an ambivalent attitude to the Church throughout his long life.
在他漫长的一生中，他对基督教信仰始终是一种摇摆不定的态度。

professional

adj. 专业的，专业性的，职业的；n. 专业人士；

例句
The whole cast executed the production with truly professional aplomb.
全体演职人员以一种真正的专业精神，从容不迫地开始了影片的制作。

demeanour

n. <正>行为，举止，态度，动作；

例句
From his general demeanour I didn't get the impression that he was being ironical.
从他整体的行为来看，我不觉得他是在讲反话。

throughout

prep. （表示时间）自始至终，在…期间，遍及…地域，遍及…场所；adv. 处处，始终，在所有方面；

例句
Most officers and men acquitted themselves well throughout the action.
大多数军官及士兵在整个战斗中表现出色。