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Short-term Investments - Classification (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
--- | --- | --- | ---
Debt securities: |  |  |
Held-to-maturity | $ 4,952,893 | ¥ 34,481,053 | ¥ 7,630,689
Trading | 114,317 | 795,849 |
Equity securities: |  |  |
Marketable | 1,713 | 11,925 |
Short-term Investments, Total | $ 5,068,923 | ¥ 35,288,827 | ¥ 7,630,689

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