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参与互动【观察者网】继考虑加强审查中美企业在人工智能等高科技领域的合作之后，美媒4月30日又披露称，白宫出于对“间谍”的担忧，想限制中国科研人员的签证。
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据今日俄罗斯报道，加拿大安大略省密西沙加市发生爆炸，已致至少8人受伤。目前尚不清楚爆炸原因。
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