电话银行是银行系统的必备服务手段之一。

Telephone bank system is one of the indispensable service to bank.

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因为Twitter推文140字符的限制，链接压缩服务实际上已经成为在Twitter上分享链接时的必备服务。

Because of Twitter's 140-character limit, URL-shortening services have become the DE facto standard for link sharing on Twitter.

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尽管如此，这仍然是您的“书架”中必备的一份出色的服务设计资料。

Nonetheless, this is a good service design resource to have on your "book shelf".

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