The reason is this.
如下。
；原因性，智；思考或证据为自己或自己一方的看法或立场辩护，着重说、论证和企图说服。 
进行激烈或热烈的争论或争辩，带一定感情色彩，常隐含“各持已见”或“争论不休”意味。力争以说服对方或求得对问题作更深入的研究。;;
;
证明为正当的;于这个原因于；因为；有道于某种原因；于某个于；因为的，有性；明智；不合智的，合的；合情合性；实际The reason is this.
如下。
oppose reason to force
以性对暴力
There is no reason to doubt the veracity of the evidence.
没有怀疑证据的真实性。
Angry for no apparent reason;
无明显的原因而恼火；
for no apparent reason she laughed.
她不知道为什么笑了起来。
the reasoning behind their decisions.
他们那些决定的。
too heady to reason with.
太专横而无法与之论
we have reason to celebrate.
我们完全有庆祝一下。
a reasoned judgement.
经过缜密分析得出的判断。
prudential reasons for an act
一个行动前经过慎重考虑的
Man is a reasoning creature.
人类是一种有性的动物。
the reason for being late
来晚的原因
use reason to solve problems
用智来解决问题
reason whether it is right
讨论这是否正确
wouldn't yield to reason;
不屈服于；
There's no earthly reason for me to go.
我根本没有走。
There was no obvious reason for the accident.
这场事故没有明显的缘。
to reason a person out of fear
劝人别害怕
You have no reason to complain.
你没有抱怨。
I demand a reason for this interruption.
我想知道这次中断的原因
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