He spoke with clearness and certainty.是什么意思？

He spoke with clearness and certainty.

他说的明白确切.

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。

spoke

n. （车轮的）辐条，轮辐，破坏某人的计划，阻挠某人的行动；v. 讲，谈( speak的过去式 )，说，演说，从某种观点来说；

例句
Mr King sought to address those fears when he spoke at the meeting...
金先生在会上讲话时试图消除那些恐惧。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

clearness

n. 晴朗，明白；

例句
Kaka is goodlooking appearence of clearness and breeziness.
卡卡是英俊的,外形清新活泼.

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

certainty

n. 确定性，确实性，确定的事，必然的事；

例句
I have told them with absolute certainty there'll be no change of policy...
我已经十分肯定地告诉他们，政策不会变。