呵呵，自己蠢了一把，应该看一下TermsOfUse.htm的，用谷歌浏览器点击时直接就弹出了这个页面的文字，才知道怎么回事： These Terms of Use outline issues such as the licences attached to downloads, protections for you, the author, and for us as a publisher. They also provide information on our Privacy Policy to ensure you are aware of the steps we take to protect your and our authors' privacy.To proceed please read the terms and conditions, check the box to indicate you understand and agree with them, and click the "I agree" button. Once you have done this you will not have to do this again while logged in unless we update the terms themselves.I have read and agree to the Privacy Policy and Terms of Use for this site 点击I Agree就可以了
These Terms of Use outline issues such as the licences attached to downloads, protections for you, the author, and for us as a publisher. They also provide information on our Privacy Policy to ensure you are aware of the steps we take to protect your and our authors' privacy.To proceed please read the terms and conditions, check the box to indicate you understand and agree with them, and click the "I agree" button. Once you have done this you will not have to do this again while logged in unless we update the terms themselves.I have read and agree to the Privacy Policy and Terms of Use for this site
点击I Agree就可以了