据美国媒体近日援引一家英国商旅管理公司的数据报道称，4月全球多国赴美商务出行预定出现下跌， 整体跌幅高达19.3%。欧洲国家赴美商务出行跌幅尤其严重，跌幅高达26%，其中德国下跌30.4%，法国 下跌22.4%，英国也下跌了14.4%。报道称，数据说明，美国在欧洲人眼中的形象正在崩塌，美国关税 政策导致美欧关系出现了很大的不确定性，这使得一些欧洲企业更愿意去寻找美国之外更加稳定的替代 市场。欧洲赴美商务出行下降的另一原因是欧洲公司对美国边境管控措施的担心。近一段时间以来，不 断有新闻曝光包括欧洲人在内的赴美人员入境时遇到各种麻烦，有的欧洲赴美人员甚至在美国遭到长期 羁押。(央视新闻) ...

2025.05. 29 本文字数：2470，阅读时长大约4分钟 导读 ：瑞典乌普萨拉大学政治学教授维德马尔姆对第一财经记者表示，一些原定于在美国举办的国际科学会议被取 消或迁至他国对美国来说是一个损失。 作者 | 第一财经 程程 英国诺丁汉大学媒体研究博士毕业生张鹤宁在今年4月初前往美国芝加哥市参加了一场为期4天的大 型学术会议。在临行前，她收到了主办方发送的一封白皮书，里面详细介绍了在入境美国时遇到签证 或边检出现问题时的应对措施、联系人员与机构，甚至包括一份向在美使馆寻求协助的邮件模版。 瑞典乌普萨拉大学政治学教授斯滕·维德马尔姆 (Sten Widmalm) 是一项关于科学会议历史的研究项 目负责人。他对第一财经记者表示，一些原定于在美国举办的国际科学会议被取消或迁至他国对美国 来说是一个损失，美国政府目前正在削弱美国在国际科学研究和交流方面的强势地位。 哈佛大学校园 (新华社图) 科学家们担心什么 维德马尔姆表示研究人员不仅在国际科学会议中讨论论文，也探讨各种共同感兴趣的话题；年轻的研 究人员能够与资深学者会面，并逐渐融入国际学术界；人们还借此发现并结识潜在的未来合作伙伴 等。"归根结底，科学是个人化 ...

Core Viewpoint - The cancellation or relocation of international scientific conferences originally planned in the United States is seen as a loss for the country, weakening its position in international scientific research and exchange [1][2]. Group 1: Impact on Scientific Community - Researchers express concerns about the increasing difficulties in attending academic conferences in the U.S. due to stricter border control policies, which have led to some conferences being postponed or moved to other countries [1][3]. - The personal nature of scientific collaboration and trust-building is emphasized, indicating that these relationships are hard to establish online [3][6]. - The case of a French scientist being denied entry to the U.S. due to perceived political views has raised alarms within the academic community, highlighting the unpredictable nature of U.S. border control measures [3][4]. Group 2: Conference Relocation and Cancellations - Several international conferences have been moved from the U.S. to Canada or Europe, including the 33rd Annual Meeting of the International Conference on Cognitive Comparison, which will be held in Montreal for the first time outside the U.S. [6][7]. - The International Society for Research on Aggression has announced the relocation of its 2026 conference from New Jersey to Ontario, Canada, due to concerns about attendance if held in the U.S. [6][7]. - The International Association for Cognitive Behavioral Therapy canceled its August meeting in Nashville, Tennessee, citing reduced federal funding and international relations issues as contributing factors [6][7]. Group 3: Broader Implications - The trend of relocating conferences may have long-term effects on the infrastructure and economy surrounding these events, potentially leading to significant losses for individual scholars, research institutions, and host cities [8].

Core Viewpoint - Trump claims that the current success rate of U.S. border control has reached 99.9%, marking the best performance in history [1] Summary by Relevant Categories Border Control Success - The reported success rate of 99.9% indicates that only 3 individuals have illegally crossed the border recently, a significant reduction compared to previous administrations where hundreds of thousands were reported [1] Historical Comparison - The statement highlights a stark contrast in illegal immigration numbers between the current administration and the previous one, emphasizing unprecedented improvements in border security [1]