No doubt it was just a clerical error.

毫无疑问，这只是一个笔误。

A " clerical error" means it's an unimportant error caused by someone who wasn't paying attention.

“笔误”意味着这是一个不重要的错误，由不注意的人造成。

She later discovered that this was due to a clerical error and that only one week later, all the women of her age group had been taken to the gas chambers.

她后来发现，这是由于一个笔误造成的，仅仅一周后，她这个年龄段的所有女性都被带到了毒气室。

But also, there was just no way to know if his name was left off that page for some other reason, or if it was just a mistake or a mishearing or a clerical error.

而且，我们也无法知道他的名字是否因其他原因而被从该页面上删除，或者这只是一个错误、听错或笔误。

Well, let me show you this book right here, which I checked out of the Denver Public Library in 2013, and through a clerical error, it slipped through the cracks, and they have no idea that it is eight years overdue.

好吧，让我在这里给你看这本书，我在 2013 年从丹佛公共图书馆借出， 由于一个文书错误，它从裂缝中溜走了， 他们不知道它已经逾期八年了。