If you decide to offer a hotline for instant user support, then you should check accessibility for that, also.

如果您决定为直接的用户支持提供热线，那么您还应该为此检查易访问性。

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There must be a mechanism in place to support unique user identification and authentication.

必须有一种机制能够支持惟一的用户标识和身份验证。

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You need to provide a mechanism to support user identification and authentication that allows for the unique identification of users.

需要提供一种机制以支持用户标识和身份验证，允许用户拥有惟一的身份标识。

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Every resource that is allocated to a free user and every hour in support spent helping a free user come at the cost of a paying user.

FORBES: Why Freemium Isn't Free

In that case, restocking on the back of a recovery in end-user demand should support a rebound in industrial production and the PMIs in March, if all goes swimmingly well.

FORBES: Barclays Warns On China

One user posted a typo-ridden email from Amazon customer support that confirms a refund given on a book that user had never bought in response to a query about Beautiful Disaster.

FORBES: The Mystery of the Amazon Refund Email