（一）包含两个以上涉及不同税率、征收率的业务；
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利文斯通被大象冲撞而亡的当地向导，曾买下一幅大象肖像照挂在家里，拍摄地点正好就是他后来遇难的地方。 摄影 张海律。电影对此有专业解读
The tradeoff is complexity. The microcode must be carefully arranged so that the instructions in delay slots are either useful setup for both paths, or at least harmless if the redirect fires. Not every case is as clean as RETF. When a PLA redirect interrupts an LCALL, the return address is already pushed onto the microcode call stack (yes, the 386 has a microcode call stack) -- the redirected code must account for this stale entry. When multiple protection tests overlap, or when a redirect fires during a delay slot of another jump, the control flow becomes hard to reason about. During the FPGA core implementation, protection delay slot interactions were consistently the most difficult bugs to track down.