因为众所周知的原因，Grvatar头像在国内一直使用不畅。以前使用别人的镜像总出问题，索性自己搭建一个。欢迎试用。
https://gravatar.ic.ci/avatar/
举个例子：
https://gravatar.ic.ci/avatar/5d3f8597eba5f2d5159ce43b177ca916
Last modification：July 15, 2023
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