by an oversight

基本解释

By an oversight, I forgot to post your letter.
我偶尔疏忽忘了把你的信寄出去。
Libya will be examined once again by an oversight committee in the House of Representatives.
而利比亚将再次接受众议院监督委员会的审查。
It can be useful to think of cloud governance by examining its opposite: the free-for-all chaos in which cloud services are used by an organization without any oversight in place.
考虑云治理时，看看它的反面是有好处的：组织使用云服务时没有任何监管，从而造成一片混乱。

Administration officials say the CIA will continue to take part in interrogations, but that an FBI official will direct the effort with oversight by the National Security Council, which reports directly to the president.

The petroleum accounts are to be audited and published annually, and spending will be monitored by an oversight committee, including representatives from civil society as well as parliament, the judiciary and the government.
ECONOMIST: Punting on a pipeline
However it was not included in the official onboard stowage list due to an oversight by the personnel who packaged and stowed the flight equipment.
FORBES: Apollo 15 Bulova Moon Watch Up for Auction at Bonhams
This could arguably be described as an oversight by many investors who did not understand the nature of their investment or the fact that they had basically no claim on the underlying assets of the company in which they were investing.
FORBES: Looking at Chinese VIE's