Two snipers have killed four police officers and injured at least six more during protests in Dallas over the fatal shootings by police of two African-Americans over the past two days in Minnesota and Louisiana.
在達拉斯進行的針對過去兩天美國警察在明尼蘇達州和路易斯安那州槍殺兩名非裔的抗議中，1名狙擊手殺死了5名警官，并致傷了至少6名警官。
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