基数词在表示确切的数字时，不能使用百、千、百万、十亿的复数形式，而是直接用在数量的后面，如5 thousand。但是，当基数词表示不确切数字，如成百、成千上万时，基数词则以复数形式出现,如thousands of，意思是成千上万的。
1、Visitors can expect to pay about a thousand pounds a day.
游客每天大概要支付1,000英镑。
2、Thousands of refugees are packed into overcrowded towns and villages.
成千上万的难民涌入拥挤不堪的城镇和村庄。
3、I must have driven past that place thousands of times.
我得有上千次开车经过那里。
4、The paintings in the chapel were perhaps a thousand years old.
小教堂里的这些画可能有1,000年的历史了。
5、A thousand pounds worth of jewellery and silver has been stolen.
价值1,000英镑的珠宝和银饰被盗。
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