序數(shù)詞：third.（表示第三）基數(shù)詞：three.（表示三個(gè)）例句：We waited three months before going back to see the specialist. 我們等了3個(gè)月才回去見那位專家。

Our team won three matches, drew one and lost two. 我們隊(duì)勝了三局，和了一局，敗了兩局。I studied in the same school with them for three years. 我和他們同過3年學(xué)。Three characters are missing in this line. 這一行里脫了3個(gè)字。He had three tries and failed each time. 他試了三回，每回都失敗了。