Today he is formally announcing his candidacy for President.是什么意思？

Today he is formally announcing his candidacy for President.

今天他将正式宣布参加总统竞选。

today

adv. （在）今天，现在，现今，现代，当代；n. 今天，今日，现代，当代，现今；

例句
He told reporters today that the president's trip to Moscow is up in the air.
今天他告诉记者们总统是否前往莫斯科尚未确定。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

formally

adv. 正式地，正规地，拘泥形式地，形式上；

例句
Two years ago, Congress formally apologized for the internment...
两年前，国会就此拘留事件正式道歉。

announcing

v. 宣布，宣告，发表( announce的现在分词 )，（尤指通过广播）通知，通报…到达，声称；

例句
I think he made a tactical blunder by announcing it so far ahead of time.
我认为他在时机远未成熟时就把这事说了出去是一种失策。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

candidacy

n. 候选人资格，候选人的地位；

例句
Today he is formally announcing his candidacy for President.
今天他将正式宣布参加总统竞选。

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

president

n. 校长，总统，总裁，董事长；

例句
The President described the killings as an abominable crime...
总统称这些血案为令人发指的罪行。