集 (jí) means “to gather; to collect; collected works; classifier for sections of a TV series etc: episode”. It is an HSK 6 Chinese character in the HSK 3.0 vocabulary.
这部电视剧一共有三十集。
Zhè bù diànshìjù yígòng yǒu sānshí jí.
This TV series has a total of thirty episodes.
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