基于这点，用户会对期望的工作流有一个概念模型，例如能够创建一封新的信件，能够选择收件人，能够发送邮件等。

Based on this, a user has a conceptual model of this task that includes certain expectations, such as the ability to create a new letter, select a recipient, and send the letter.

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当发送电子邮件时，你还可以把一份文件作为附件发送，该文件可以是图片、程序、或声音文件等。

When you send an e-mail you can also send a file as an attachment and that file can be a graphic, a program, a sound or whatever.

《柯林斯英汉双解大词典》

举个例子，交付准备服务器必须配置正确，避免发生诸如发送测试邮件给所有用户，或是通过正式支付网关下订单等问题。

For example, a staging server must be property configured so it won't do things like send out test emails to all of your customers or place orders through a live payment gateway.

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