Unusual transactions are the transactions which happen rarely because of the abnormal amount or nature.

非常规交易是指由于金额或性质异常而不经常发生的交易。

youdao

Mr Woodford says his sacking may have more to do with some very large and unusual transactions that he challenged Mr Kikukawa and other executives to explain.

伍德福德称开除他的原因可能更多与他要求菊川冈以及行政部门对一些异乎寻常的大额交易做出解释有关。

youdao

Unusual behavior of underlying processes (for example, credit card transactions that do not follow the usual patterns)

异常行为（例如，不符合通常模式的信用卡事务）

youdao

First, none of the unusual transactions seemed to register on the radar screens of regulators.

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You also can set email or text alerts so you'll know quickly about unusual transactions in your accounts.

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This is but the latest in a serious of unusual transactions.

ECONOMIST: Emissions