We pick i.root-servers.net, one of the 13 root servers (1), and ask it about meettaiwan.tw and learn that tw is delegated to ten name servers (2), so we ask c.dns.tw where we learn that meettaiwan.tw is delegated to two name servers, including rsdn1.octor.com (3), so we ask that one and get the following answer:
Meettaiwan.tw is a domain controlled by two domain name servers at octor.com. Both are on different IP networks. Incoming mail for meettaiwan.tw is handled by one mail server at meettaiwan.tw themselves. We are missing the IP:s of one server: meettaiwan.tw.