没理由的英文：
had no occasion for

参考例句：

There is no reason to discredit what she says.
没理由不信她说的话。

had是什么意思：
v. [have] 的过去分词形式；有，使

They had had a row, and she had locked him out of the apartment.
他们吵了一架，于是她把他锁在公寓外面。

The defendant claimed that he had not had a fair trial.
被告声称未获公正审讯.

While they had been unconscious, the world had changed.
她们不知道就在自己失去知觉的那段时间里世界发生了变化。

It transpired that the gang had had a contact inside the bank.
据报这伙匪徒在银行里有内应.

It was supposed that he had had a sudden attack of faintness
据估计，他当时突然头晕发作。

occasion是什么意思：
n. 场合，盛典；时机
v. 引起，惹起

Well, it's a big occasion.
嗯，这个场面很宏大。

On this occasion the lodge sent a carriage.
为了当晚的演出，支部派了马车来接她。

A solemn occasion; ceremonial garb.
庄重的场合；正式的服装。

It is an occasion for all the family to celebrate.
这是个值得举家庆祝的时刻。

You have no occasion to buy another car.
你没有必要再买一辆汽车。