Because it is difficult to trace hackers, exactly who isbehind any specific attack and how and where they operate remains to alarge extent a mystery, technology experts say.
技术专家说,因为黑客很难追踪,所以谁是攻击的幕后黑手很难确定,他们在哪里以及如何发动的攻击在很大程度上也都是谜。
It is very difficult to say when and where the first lamp was used, but they are mentioned in all three early ages - lamps were used in Egypt, Greece, and Rome.
台灯起源的时间和地点已无从得知,但是最早的3个时期都有台灯的记载——埃及,希腊和罗马。
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