Carbonite has a free 15 day trial (with no credit card required).

Carbonite有15天的免费试用(不需要信用卡)。

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Some teenagers make purchases on the Internet (on sites like eBay) but this is only used by a small percentage, as a credit card is required and most teenagers do not have credit CARDS.

有些青少年会在网上付费消费(如像ebay这样的网站)，但这只是少数一部分人，因为这些通常都需要信用卡而青少年并不拥用信用卡。

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Conditions specify exceptions that, if true, expire the permissions, and renegotiation may be required (for example, if the credit card expires, then all permissions are withdrawn to play the video).

Condition指定如有例外，就让权限过期无效，可能需要重新进行协商(比如，如果信用卡过期了，就会收回播放视频的所有权限)。

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Typically, banks, credit unions, mortgage brokers, and credit card companies are required to make such verification as part of the loan approval process.

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In the past, most internet transactions required a credit card or an online payment system like PayPal (NASDAQ: EBAY), creating an effective digital paper trail for people engaging in online transactions.

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Another problem that is likely to contribute to spam is that it is quite easy to create bogus accounts for the Ping service because no credit card or other positive identification is required to participate.

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