Many crimes go unrecorded.

许多罪行都未记录在案。

《牛津词典》

All cases are voluntarily reported, and many more are likely to go unrecorded, sometimes because librarians have been threatened with dismissal if they sound the alarm.

所有这些投诉案件都是当事人自愿报道的，还有更多人可能不愿被记录下来。有时图书馆工作人员因受到解雇威胁而不敢发出警告。

youdao

Since cash transactions are unrecorded, they can easily go unreported.

因为现金交易没有记录可查，他们可以轻易地进行而不被检举。

youdao

For every case that gets registered, he says, at least nine go unrecorded.

BBC: Sarika (centre) with her parents

The story that led to the document's exhibition won't go unrecorded.

WSJ: Truce Ends Tussle Over Bill of Rights

That estimate may only be the tip of the iceberg, the group said, as people may not seek medical attention for food poisoning and cases go unrecorded.

CNN: Food poisoning: What you need to know