the law of the jungle idiom
丛林法则，弱肉强食
the idea that people who care only about themselves will be most likely to succeed in a society or organization
We hope for a world where the rule of law, not the law of the jungle, governs the conduct of nations. 我们期盼一个以法律制度而不是丛林法则来规范各国行为的世界。