When used properly, worry is an incredible device.
如果运用得当，忧虑也是一种不可思议的工具。
It is efficient when used properly.
正确使用时，它才有效。
In fact, when used properly, credit CARDS are a very powerful wealth-building tool!
事实上，当运用得当，信用卡是一个非常强大的财富建设工具！
In fact, when used properly, credit CARDS are a very powerful wealth-building tool!
事实上，当运用得当，信用卡是一个非常强大的财富建设工具！
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