有些功能主要是在后台进行的，比如改进的 FTP 协议处理程序。

Some features are mostly behind the scenes, like the improved FTP protocol handler.

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这个协议可以为美国多功能战机向印度销售开辟一个主要的通道。

This pact could open the way to a major sale of U.S. multi-role fighter jets to India.

youdao

基于DSig的协议有个很主要的优势——断定身份的同时还能创建消息内容的防篡改信封，这两个功能通常都要求同时出现。

One of the key advantages of DSig-based protocols is the ability to both assert identity and create a tamper-proof envelope of the content of the message which are often both required together.

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