letter drop
... letter case 袖珍信件夹 letter drop 投信口 letter form 书信形式 ...
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信件投递口 mail slot
不用朝投信口里张望了，这里静静的没有一点儿声响，他们准把我们来这里的事忘了。
There's no use peering through the letter-box. The place is as still as the grave. They must have forgotten we were coming.
youdao
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