server ntp.cuhk.edu.hk
server ntp.ie.cuhk.edu.hk
#content from ntp.conf.hk
server clock.redhat.com
server time.apple.com
server pool.ntp.org
server mit-main.ron.lcs.mit.edu
server ucsd.ron.lcs.mit.edu
server utah.ron.lcs.mit.edu