中文回答：
2025 年出国留学是否需要证明文件，取决于目标国家、学校及具体课程的要求。通常，留学所需的证明文件包括但不限于：学历证明（如毕业证、学位证）、成绩单、语言能力证明（如雅思、托福成绩）、资金证明（证明有能力支付学费和生活费）、健康证明、护照等。部分国家或学校可能还会要求额外材料，如推荐信、个人陈述、作品集等。建议根据具体申请的学校和项目，查阅其官方网站或联系招生部门获取最新要求，以确保材料齐全。
英文翻译：
Whether certifications are required to study abroad in 2025 depends on the requirements of the target country, university, and specific program. Generally, necessary documents for studying abroad may include but are not limited to: academic credentials (such as graduation certificates, degree certificates), academic transcripts, language proficiency proofs (e.g., IELTS, TOEFL scores), financial statements (to demonstrate the ability to cover tuition and living expenses), health certificates, passports, etc. Some countries or universities may also request additional materials like recommendation letters, personal statements, or portfolios. It is recommended to check the official website of the applied university or contact the admissions office for the latest requirements to ensure all documents are prepared appropriately.