hellodoctor.cn.		30 IN SOA 17ex1.dns.com. admin.dns.com. (
				1733303543 ; serial
				7200       ; refresh (2 hours)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				1800       ; minimum (30 minutes)
				)
hellodoctor.cn.		30 IN CNAME show.17ex.com.
hellodoctor.cn.		30 IN CNAME show.17ex.com.

show.17ex.com.		30 IN A	8.210.157.232
hellodoctor.cn.		30 IN CNAME show.17ex.com.

Name servers:
hellodoctor.cn.		30 IN NS 17ex1.dns.com.
hellodoctor.cn.		30 IN NS 17ex2.dns.com.