announce v. /declare v. /claim v.

announce的意思是“通知，宣布(结果，决定等)”;

declare的意思是“宣布(公告，法律等)，声明”;

claim意为“声称，要求得到，认领”。

例：She announced that the singer would give one extra song.

她宣布歌手将再加唱一首歌。

The United States and China had declared their normalization of diplomatic relations.

中美双方宣布了双边外交关系的正常化。

They declared martial law in the mining communities.

他们宣布对矿区实行军事管制。

If anybody owns this camera, will he or she please come forward and claim it?

请这部相机的失主前来认领。

She claims to be as good a pianist as Themelis!

她声称自己的钢琴弹得与Themelis一样棒。