To be obliged or required by morality, law, or custom.
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1. He cannot be so young; he must be over thirty. (±×°¡ ±×·¸°Ô ÀþÀ» ¸®°¡ ¾ø´Ù. ±×´Â Ʋ¸²¾øÀÌ 30¼¼´Â ³Ñ¾úÀ» °ÍÀÌ´Ù) 2. How you must have hated me! (Çʽà ³ª¸¦ ¹Ì¿öÇß°ÚÁö) 3. I told him that I must go. (³ª´Â ±×¿¡°Ô ³»°¡ °¡¾ß ÇÑ´Ù°í ¸»Çß´Ù) 4. All students must keep quiet in the library. (¸ðµç ÇлýÀº µµ¼°ü¿¡¼´Â Á¶¿ëÈ÷ ÇÏÁö ¾ÊÀ¸¸é ¾ÈµÈ´Ù) 5. If you must, you must. (²À ±×·¡¾ß ÇÑ´Ù¸é ÇÏ´Â ¼ö ¾øÁö)