自然数集 Traditional 自然數集 zì rán shù jí 🔊 the set of natural numbers + Keep this word Meanings zì rán shù jí 自然數集 (math.) the set of natural numbers Its characters 自zìself; oneselfHSK 4然ráncorrect数shǔto countHSK 4集jíto gatherHSK 5