https://blog.csdn.net/Holden_Liu/article/details/102757625
（2）https://blog.csdn.net/weixin_42147770/article/details/127899670
（3）https://www.cnblogs.com/xuqing125/p/15909359.html
env中 start ，seq
标签：sequence,0106,blog,csdn,UVM,https,net From： https://www.cnblogs.com/fancy2333/p/17029242.html