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PROPERTY AND EQUIPMENT, NET - Depreciation (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Depreciation expense
Depreciation of property and equipment	¥ 1,543,130	¥ 1,057,171	¥ 682,451
Cost of revenue
Depreciation expense
Depreciation of property and equipment	1,418,846	1,045,446	674,560
General and administrative expenses
Depreciation expense
Depreciation of property and equipment	120,604	10,448	7,319
Research and development expenses
Depreciation expense
Depreciation of property and equipment	¥ 3,680	¥ 1,277	¥ 572

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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- References

No definition available.

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