1
be enclosed in/within sth
表示物理封闭或包含。
The key is enclosed in an envelope.
钥匙被封在信封里。
封闭的；被包围的；附上的
先理解核心含义，再看它在真实句子里的用法。
封闭的；被包围的；附上的
closed in or surrounded; included within
The key is enclosed in an envelope.
钥匙被封在信封里。
被包含；在容器内
Contained; held within a container.
被墙、栅栏或类似障碍物包围的
Surrounded by a wall, fence or similar barrier.
有封闭的板条
Having closed slats.
The enclosed garden was filled with blooming flowers.
那个被围墙环绕的花园里开满了鲜花。
Please sign the enclosed form and return it to us.
请签署随函附上的表格并寄回给我们。
The enclosed space felt stifling in the summer heat.
这个封闭的空间在夏天的高温下让人感到闷热。
表示物理封闭或包含。
The key is enclosed in an envelope.
钥匙被封在信封里。
enclosed作定语，常出现在信件或包裹中。
Please see the enclosed document.
请见附上的文件。
商务信函固定用语，表示随信附上。
Please find enclosed a copy of the contract.
随函附上合同副本一份。
Not this
The document enclosed in the email.
Use this
The document is enclosed in the email.
中文常将“附上”直接作谓语，但英语中"enclosed"是形容词或过去分词，必须与系动词连用。
Not this
Please check the enclosed.
Use this
Please check the enclosure.
中文用“附件”直接指代实物，但英语中"enclosed"是形容词，不能单独作名词，应改用名词"enclosure"。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
封闭空间
The camera can be used in an enclosed space.
这款相机可以在封闭空间内使用。
围起来的区域
Children should play in an enclosed area.
孩子们应该在围起来的区域玩耍。
封闭式花园
They have a beautiful enclosed garden behind the house.
他们房子后面有一个漂亮的封闭式花园。
附上的信函
Please find the enclosed letter from our lawyer.
请查收附上的来自我们律师的信函。
附上的文件
The enclosed document contains the contract details.
附上的文件包含合同细节。
随函附上
Enclosed herewith is my application form.
随函附上我的申请表。
Use enclosed naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
en-（进入）+ close（关闭），东西被关在里面，就是‘封闭的、附上的’。
语域：formal 常见场景：信件、文档、包裹 通常用于正式信件或文件中，表示附件或封闭空间。
用于描述封闭或包含的状态，常与介词in或within连用。
Dictionary facts from ECDICT, WIKTIONARY.