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用英語表達"a 是 b 的 n 倍長（寬，高，大，重等）"，"a 比 b 長（寬，高，大，重等）n 倍" 或"a 的長度（寬度，高度，大小，重量等）是 b 的 n 倍"，可用下列幾種句型。

  1."a + be + 倍數(shù) + as + 計量形容詞原級 + as + b".
this tree is three times as tall as that one. 這棵樹是那棵樹的三倍高。
his father is twice as old as he. 他父親的年紀(jì)有他兩倍大。

  2."a + be + 倍數(shù) + 計量形容詞比較級 + than + b "
the yangtze river is almost twice longer than the pearl river.
長江差不多比珠江長兩倍。
the dictionary is exactly five times more expensive than that one.
這本字典比那本恰好貴5倍。

  3."a + be + 倍數(shù) + the + 計量名詞 + of + b "
the newly broadened square id four times the size of the previous one.
新擴建的廣場是未擴建時的四倍大。

  4."the + 計量名詞 + of + a + be + 倍數(shù) + that + of + b "
the size of the newly broadened square is four times that of the previous one.
新擴建的廣場為以前的四倍大。

  5.其它
i'm twice/ double his age. 我的年齡是他的兩倍。
i've paid five times the usual price for the stamp.
我出了5倍于往常的價格買這枚郵票。
 
the average income of the staff has been increased by 50 percent compared with last year. 與去年相比，該單位職工的收入增加了50%.
the price of tvs are twofold( adj. 兩部分的, 雙重的) down over these years.
近幾年來，電視機的價格下降了兩倍。