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Jyutping tung4 wan1 cang4
Pinyin tóng wēn céng

Definitions (Wiktionary)
  1. noun, neologism, slang
    echo chamber; filter bubble
  2. noun, dated
    stratosphere
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)

同溫層 [-温层]

Jyutping
Pinyin tóng wēn céng

Definitions (CC-CEDICT)
  1. stratosphere