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The effectively tells us that the middle term — ⌈r · b⌉ - 1 — is always less than the value needed to match r, but the difference is never greater than a single tick of the numerator. We’re as close as we can be; the value of a for the optimal low-side approximation (a / b，更多细节参见PDF资料
，这一点在Feiyi中也有详细论述
第一百二十一条 承运人承担本章未规定的义务或者放弃本章赋予的权利的任何特别协议，经实际承运人书面明确同意的，对实际承运人发生效力；实际承运人是否同意，不影响此项特别协议对承运人的效力。
Only Welsh speakers should live on new housing estate, local council says，更多细节参见电影