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Cash and cash equivalents
12 Months Ended
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]  
Cash and cash equivalents
5.
Cash and cash equivalents
 
Cash and cash equivalents represent cash on hand, demand deposits placed with banks or other financial institutions and all highly liquid investments with maturities of three months or less. Cash and cash equivalents balance as of December 31, 2017 and 2018 primarily consist of the following currencies: 
 
 
 
December 31, 2017
 
 
December 31, 2018
 
 
 
Amount
 
 
RMB

equivalent
 
 
Amount
 
 
RMB

equivalent
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RMB
 
 
1,627,044
 
 
 
1,627,044
 
 
 
4,707,868
 
 
 
4,707,868
 
US$
 
 
151,529
 
 
 
990,388
 
 
 
188,869
 
 
 
1,296,284
 
Others
 
 
-
 
 
 
-
 
 
 
N/A
 
 
 
79
 
Total
 
 
 
 
 
 
2,617,432
 
 
 
 
 
 
 
6,004,231