消息来源：
https://twitter.com/TheSteinLine/status/1021410164447072256
Dirk Nowitzki will today sign a one-year, $5 million deal with the Dallas
Mavericks that sets him up for a record-setting 21st consective season with
the same team, according to league sources.
Nowitzki 将会在今天与独行侠队正式完成续约
双方预计签下一年500万元的合约
短评或心得：
德佬为单一球队效力21个赛季，也会成为NBA史上的新纪录，超越原先由Kobe所保持的20季