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Cost of Revenue (Excluding Impairment Loss) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Dec. 31, 2020
Cost Of Revenue Disclosure [Abstract] |  |
COST OF REVENUE (EXCLUDING IMPAIRMENT LOSS) | 9. COST OF REVENUE (EXCLUDING IMPAIRMENT LOSS) Cost of revenue (excluding impairment loss) consisted of the following:
|  | For the six months ended June 30, 2020 |  | For the six months ended June 30, 2021
|  | RMB |  | RMB
|  | (unaudited) |  | (unaudited)
Lease expenses |  | 207,766 |  | 116,054
Employee compensation and benefits |  | 29,992 |  | 51,393
Depreciation and amortization |  | 23,953 |  | 38,667
Advertising cost |  | 111,279 |  | 221,565
Other operating costs(i) |  | 74,027 |  | 102,431
Total |  | 447,017 |  | 530,110
(i) Including costs for construction and design services, utilities, maintenance, daily cleaning and others. | 16. COST OF REVENUE (EXCLUDING IMPAIRMENT LOSS) Cost of revenue (excluding impairment loss) consisted of the following:
|  | For the years ended December 31,
|  | 2018 |  | 2019 |  | 2020
|  | RMB |  | RMB |  | RMB
Lease expenses |  | 383,690 |  | 494,111 |  | 345,208
Employee compensation and benefits |  | 38,118 |  | 71,134 |  | 68,890
Depreciation and amortization |  | 77,579 |  | 109,875 |  | 76,209
Advertising costs |  | 22,292 |  | 469,367 |  | 278,679
Other operating costs(i) |  | 141,930 |  | 224,905 |  | 199,083
Total |  | 663,609 |  | 1,369,392 |  | 968,069
Notes: (i) Including costs for construction and design services, utilities, maintenance, daily cleaning and others.

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