美国签证系统怎么更新？
2016年4月份更新过，具体原因未知 更新前：
“The United States visa application web site has been updated. If you would like to view these changes， please click the link below”
更新后：
“You may visit your online case status in either English or Spanish at any time during the processing of your visa application. Please allow up to two weeks for new records to appear on our website following submission to the Visa Application Center(VAC). Your application information will be available here once it is entered into our database by the VAC staff and will reflect all subsequent action taken regarding your case including but not limited to interview appointment， denial notification etc… The only way we can provide an actual date that your record was uploaded onto the system is if a document from the consulate is being returned to USCIS electronically through email. This typically takes about one to three days after the consulate receives/opens it depending upon mail delivery times. Once the electronic copy arrives with USCIS，it can take several more days before your record appears since they then have to enter this into their system as well. In addition， documents received back via FedEx/DHL usually do NOT arrive within one day so even if there were no other delays，they could be up to five business days past “received at consulate” until they reach USCIS．If you are having difficulty finding specific information on this page，you can use the search bar located above the navigation bars on every page to find what you need”