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This is why repeated attempts at reform legislation have failed in recent years, leaving the Postal Service unable to pay its bills except by deferring vital modernization.

(1) why引导一个表语从句,leaving......为一个v-ing短语做结果状语

(2) 本句译文:这就是为什么近年来在改革立法方面的各种努力都失败了,这也导致邮政服务不能偿还各种欠款,除了推迟至关重要的现代化。