After all, APL was made to write mathematics on the blackboard more easily.
When your iteration count is known in advance and your state is a single value, foldl' is the right tool. The trampoline is for when you don't know the count, your state is compound, or both.
，详情可参考新收录的资料
第一条 为了调整海上运输关系、船舶关系，保护当事人各方的合法权益，加强海洋生态环境保护，促进海上运输和经济贸易高质量发展，制定本法。。新收录的资料是该领域的重要参考
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