1. 缚上；系上；贴上
    If you attach something to an object, you join it or fasten it to the object.

    e.g. We attach labels to things before we file them away...
           存档前，我们先贴上标签。
    e.g. The gadget can be attached to any vertical surface...
           这小玩意儿可以粘在任何垂直表面上。

2. （通常未受邀请而）加入，和…在一起，缠着
    If someone attaches himself or herself to you, they join you and stay with you, often without being invited to do so.

    e.g. Natasha attached herself to the film crew filming at her orphanage.
           娜塔莎紧紧缠着在孤儿院拍摄电影的工作人员不放。

3. 赋予;认为…具有;为…所有
    If people attach a quality to someone or something, or if it attaches to them, people consider that they have that quality.

    e.g. The authorities attached much significance to his visit.
           当局非常重视他的访问。
    e.g. ...the magic that still attaches to the word 'spy'.
           “间谍”一词依然具有的神奇魅力

4. 附加，附带（条件）
    If you attach conditions to something such as an agreement, you state that specific things must be done before the agreement is valid.

    e.g. Activists are pressing the banks to attach political conditions to the signing of any new agreement...
           激进分子强烈要求银行在签署任何新协议前要考虑政治条件。
    e.g. Magistrates will be able to attach conditions when juveniles are remanded.
           地方法官将可以在少年犯送押时提出附加条件。

5. （计算机中）附上，粘贴（附件）
    In computing, if you attach a file to a message that you send to someone, you send it with the message but separate from it.

    e.g. It is possible to attach executable program files to e-mail.
           可以在电子邮件里附上可执行程序文件。

6. see also: attached
    no strings attached -> see string