As critical talks over Iran’s nuclear programme entered their second round on Thursday night, and a vast US military buildup continued in the Middle East, the Trump administration warned of drastic consequences if Iranian negotiators failed to make significant concessions.
以前总认为，唐人的境况，只是在无尽春山里做自己的主人。其实逍遥只是一面，加上另一面的彷徨与踟蹰，才合成完整的唐人生活图景。
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Real-mode programs freely execute CLI and STI to control interrupts, PUSHF and POPF to manipulate flags, INT n for DOS and BIOS calls, and IN/OUT for hardware I/O. In normal protected mode, these instructions are privilege-checked -- they execute normally if the caller has sufficient privilege, and fault otherwise. The 386 can't simply let V86 tasks execute them freely -- a DOS program disabling interrupts would bring down the whole system -- but trapping on every INT 21h call would make V86 impractically slow.