a declaration of income的用法和样例：
- A declaration of opinion; an assertion.
- A declaration of freedom was issued by the leaders.
- Be polite; write diplomatically; even in a declaration of war one observes the rules of politeness.
要有礼; 要按外交辞令写; 即使在宣战文告里，依然是要遵循礼节。
- At the begin of world war two, hitler invade poland without a declaration of war.
- The company made a declaration of its business interests.