stern-drop stall 尾坠失速
stern drop 艉落
“We’ve seen a sustained drop in global volumes, ” Henry Stern, a senior security analyst at Cisco Systems, said in a telephone interview from San Francisco.
“我们发现全球的垃圾邮件量稳步下降”，Cisco的高级安全分析师Henry Stern在一次电话采访中说道。
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