wdtuan.cn.		30 IN SOA dm1.dns.com. dnsadmin.dns.com. (
				1722519989 ; serial
				7200       ; refresh (2 hours)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				1800       ; minimum (30 minutes)
				)

wdtuan.cn.		30 IN A	156.234.252.53

Name servers:
wdtuan.cn.		30 IN NS dm1.dns.com.
wdtuan.cn.		30 IN NS dm2.dns.com.