occurrence中等

As the brain [fades], we refer to these occurrences as “senior moments.”

随着大脑衰退，我们把这些情况称为“老年时刻”。

The fact that this is not an [uncommon] occurrence means that dishonest persons might be able to access bank accounts in electronic payments systems and [steal] from someone else’s accounts.

这种事并不罕见，这意味着不法之徒可能侵入电子支付系统中的银行账户，从他人账户中窃取钱财。

the common occurrence of train delays.

列车延误很常见。