3用英文是three。

英 [θri:] 美 [θri]

三;三个;第三（章，页等）

n.

三岁;三个人[东西];三，三个

adj.

三的;三个的

There are examples of how to use numbers at the entry for five . 数词用法示例见five条。

习语

the three Rs

(old-fashioned) 初等教育三要素（被视为儿童教育最重要部分的读、写、算）

reading, writing and arithmetic , thought to be the most important parts of a child's education

in twos and threes

三三两两；稀稀拉拉

two or three at a time; in small numbers

People arrived in twos and threes.

人们三三两两地到了。

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