2dns.cn.		30 IN SOA ns1.dns.com. admin.dns.com. (
				1754790462 ; serial
				3600       ; refresh (1 hour)
				300        ; retry (5 minutes)
				1209600    ; expire (2 weeks)
				1800       ; minimum (30 minutes)
				)

Name servers:
2dns.cn.		30 IN NS ns1.dns.com.
2dns.cn.		30 IN NS ns2.dns.com.