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[2020年上半年CNN news] CNN双语新闻(翻译+字幕+讲解):部分国家考虑发放"免疫护照" 世卫组织
像冠状病毒这种疾病,在没有疫苗时,如果有足够的人感染、康复并产生免疫,那就会出现群体免疫。2020-06-29 编辑:aimee
Severity: Notice
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Filename: libraries/Cache_file.php
Line Number: 28
Severity: Warning
Message: Memcache::connect(): Can't connect to 127.0.0.1:11211, Connection refused (111)
Filename: libraries/Cache_file.php
Line Number: 28
2020-06-29 编辑:aimee