密集 mìjí concentrated
concentrated; crowded together; intensive; compressed
How to remember 密集: 密 secret + 集 to gather = concentrated.
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How it is used
- Densely packed / intensive: 人口密集 (rénkǒu mìjí) densely populated, 密集训练 (intensive training), 密集恐惧症 (trypophobia).
- Adjective describing many things crowded close in space or time.
- Contrast 稀疏 (xīshū, sparse). Also 密集型 as in 劳动密集型 (labor-intensive).