求教这句英语中的when的意思

Why pay more money to say"on next Sunday" when "next Sunday"would have been enough?请问这句话中的when是什么什么意思?代表什么?

Why pay more money to say"on next Sunday" when "next Sunday"would have been enough?

为什么要花更多的钱说“下星期日”,“下星期日”就够了?追问

不是整句话的意思,我知道整个句子的意思,就是不知道when的作用和意思

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