Each MIME part with attachment can specify its content type too.
每个带附件的MIME部件也都可以指定其内容类型。
You can extract a number of information from the MIME body part including the content id, content type, and location.
您可以从MIME主体部件抽取许多信息，包括内容标识、内容类型和位置。
It also serves the dual purpose of providing the MIME type when a file's content is being sent to the browser.
它还有一个作用，那就是在将文件内容发送给浏览器时提供MIME类型。
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