There is no question that Donald Trump's mastery of Twitter has taken presidential interactions into a new era of mass communication. But, on his way back from last month's G7 meeting in Sicily, the US president had a tweet aimed at a more limited audience: trade wonks.
毫无疑问，唐纳德•特朗普(Donald Trump)对Twitter的娴熟应用已把总统互动带入一个大众传媒的新时期。但在上月从七国集团(G7)西西里峰会回国时，这位美国总统发布了一则推文，面向人数有限的受众：贸易学究。
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