1.million的基本意思是“百万”,也可作“百万个(人或物)”“百万英镑〔美元〕”解,用于比喻可指“许多”。
2.million用作定语且有a或其他数词修饰时,一般要用单数形式; 用在of短语前或表示不确定数字时常用复数形式。million指“钱”时可用单数形式,也可用复数形式。
3.含有million的词语作主语时,谓语动词一般用复数形式。指“钱”时,如为确定的钱数,谓语动词一般用单数形式,如为不确定钱数,谓语动词一般用复数形式。

a/one chance in a million
〈非正〉 机会很小a very small chance
You might get a seat on the train but it's a chance in a million.在火车上你也许能找到座位,但是希望很小。

feel〔look〕 like a million dollars
感觉好极了,样子很神气feel〔look〕 wonderful
Mother feels like a million dollars today.母亲今天感觉挺好。
She was wearing her new dress, looking like a million dollars.她穿着新衣服,看上去很漂亮。

in a million
千里挑一的,最好的one of the best possible; extremely good
He said she was the nicest girl he had met, a girl in a million.他说她是他所见到过最好的姑娘,真是百里挑一。

The resident population of the city is more than one million.该城市的人口为100多万。
The newspapers' readers are numbered by millions.这些报纸读者有数百万。
The air is full of millions of invisible germs.空气中充满了许多看不见的细菌。
Dinosaurs have been extinct for millions of years.恐龙已绝种几百万年了。
Let's make believe we have a million dollars.让我们假扮成百万富翁的样子。
A careless mistake cost the company millions of dollars.一次疏忽造成了公司数百万美元的损失。
Three million dollars was set aside.拨出了300万美元。
Millions of dollars have gone into the building of this factory.在修建这座工厂时花掉了数百万美元。

［词源］＜古法语milione(一千个千)