The concept is simple: users sign up for free, linking a credit or debit card to their account.
这项服务的理念很简单：用户免费注册后，将一张信用卡或借记卡与账户挂钩。
The concept of linking two countries was impressive, a fabulous idea.
这种连接两个国家的观点让人印象深刻并且难以置信。
Other platforms have the concept of weak linking which does much the same runtime checks.
其他一些平台的弱链接——weak linking概念也是做类似的运行时检查。
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