虽然正规教育对于培养分析能力和获取知识和技能来说是必不可少的，但没有任何事可以替代实践经验，尤其是在培养领导人方面。
While a formal education is essential to develop analytical abilities and gain knowledge and skills, there is no substitute for hands-on experience, particularly in developing leaders.
其他替代方案在理论上很有吸引力，但在实践中要么不切实际，要么只能提供微不足道的改进。
The other alternatives are attractive in theory but in practice are either impractical or offer only marginal improvements.
60年的实践证明，安理会在解决事关世界和平与安全的重大全球和地区问题上具有不可替代的作用。
Practices in the past 60 years have proven UN Security Council has indeed had an irreplaceable role to play in resolving major global and regional issues bearing on world peace and security.
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