我偶尔疏忽忘了把你的信寄出去。
By an oversight, I forgot to post your letter.
youdao
在一个像我们这样庞大的机构里，我们偶尔有人疏忽犯错是不可避免的。
In an organisation our size, it is inevitable that we will from time to time see people slip up and make an error.
By an oversight, Iforgot to post your letter.
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