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"띠 (ddi)" or "허리띠 (heo-ri-ddi)" or just "벨트 (belt)"
yes, that is why "Vietnam" exists, check out a map sometime, they're actually useful.
No he ddi not
DDI (Direct Dial Inwards) telephones allow the user to have multiple telephone numbers, without the need to have expensive direct lines.
you just ddi ^_^