逐步 (zhú bù) means “progressively; step by step”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
学习语言需要逐步积累词汇和语法知识。
Xuéxí yǔyán xūyào zhúbù jīlěi cíhuì hé yǔfǎ zhīshi.
Learning a language requires gradually accumulating vocabulary and grammar knowledge.
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