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.
毫無疑問，唐納•川普(Donald Trump)對Twitter的嫺熟應用已把總統互動帶入一個大眾傳媒的新時期。但在上月從七國集團(G7)西西里峯會回國時，這位美國總統發佈了一則推文，面向人數有限的受衆：貿易學究。
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