announce 指对公众或特定的一群关心的人进行宣布，常指大家感兴趣的事，如国家大事、商品信息、生死病婚、开会等新闻。
Everyone was silent as he announced the winner of the competition.
当他宣布竞赛的获胜者时,大家都静静地倾听。
The captain announced that the plane was going to land.
机长宣布飞机就要着陆了。
The government announced that they would build a new highway to the mountain.
政府宣布他们将修建一条通向山区的新公路。
declare 指在庄严场合，官方权威人士公开郑重宣布，有时指在公共场合对某事表明态度。
declare war
宣战
declare peace
宣布和平
declare sb. (to be) innocent
宣布某人无罪
She declared that she didn't want to see him again.
她宣称她再也不愿见到他。
The government declared war on the drug dealers.政府向毒品贩子宣战.(declare war on/against…向…宣战;proclaim war宣战)
proclaim 指官方事务中当局对大众所作的重要宣布，用于公共或正式场合, 特别指“重大的事件”, 着重“庄严地向广大群众宣布”或“严肃认真地申明”。
to proclaim a law
公布一项法令
proclaim the founding of a republic
宣告一个共和国的成立。
The ringing bells proclaimed the news of the birth of the prince.
钟声宣告了王子的诞生。
