- 问题详情:Livingaloneinaforeigncountrycanbedifficult.Safetyisabigproblem,andImustbecarefulandstayvigilant(*惕的)allthetime.Bostonisastrangecity.Itmaylookwonderfulinoneareabut,justablocklater,younolongerfeelsafe.Run-downbuildings,scary-lookingsculpture,...
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