他是他们的简称 He is short for them ; He is their short ; He is their acronym
是他名字的简称 His name is short for ; Is short for his name ; His name is the acronym
是的简称
Yes, short for.
以上为机器翻译结果，长、整句建议使用 人工翻译 。
换句话说，是的，我们要非常担心。格拉格把自己称作因特网电话方面——或者经常被简称为VOIP方面的顶级安全专家。
In other words yes, very worried. The Grug as he styles himself is a leading security expert specialising in Internet telephony or VOIP as it is often called.
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