SEVIS Fee 如何在网上缴纳？是不是要专门办个银行卡或者信用卡？请虫友们指点。
另外看缴费网站上说缴费的收据是要立刻打印的吧（You must be able to print the Form I-901 payment coupon or payment receipt when you complete the form online. Ensure a printer is connected and working before continuing. You cannot return to the page and print the coupon or payment receipt at a later time.），否则就没法打印了？
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