词汇：envelope

n. 信封，封皮；[生]包膜；[天]包层；[数]包迹

相关场景

The boy places the form letter into an envelope, addressesit, and sets it on a pile of identical letters. Little Paul picks up a new letter and opens it.
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MALCOLM:
It's me. He stops before a pile of mail collecting on a thin table. He stares at it blankly. Almost every envelope has "Over Due" or "Final Notice" stamped on it.
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Answer:
一个信封