herald
/ˈherəld; `hɛrəld/ n
1 (formerly) person who made important announcements and carried messages from a ruler （旧时）传令官, 使者, 信使.
2 person or thing that announces or shows that sb/sth is coming 报信者; 先兆
In England the cuckoo is the herald of spring. 在英国, 杜鹃鸟预告春天的来临.
3 (Brit) official who keeps records of families that have coats of arms (coat) 司宗谱纹章的官员. herald, v [Tn, Tn.p]
~ sb/sth (in) announce the approach of sb/sth 宣布某人[某事物]即将来临
This invention heralded (in) the age of the computer. 这项发明宣告了计算机时代的到来.