核心问题
“当被修饰的名词前面有表示长宽高,度量,年龄等的数词时,形容词 long, wide, tall, deep, old 等须放在被修饰名词之后。
The bay is about thirty miles long and five to six miles wide. 这个海湾约30英里长，5至6英里宽。
The moon is fifteen days old. 月亮已盈。”(《英语语法探幽揽胜》，上海交大出版社，03,p.2)
《英语语法难点精解》(外研社, p. 56) 也说: “表达度量的形容词, 如: old, young, tall, high, long, deep, wide, across, broad, thick 等作定语时要后置。例如:
This building is ten stories high. 这幢大楼十层高。
This river is about one hundred metres wide. 这条河大约一百米宽。”
请问上面的形容词 long, wide, old, high 是作名词的定语吗？
admit
词典解答
在上面的句型里,形容词 long, wide, old, high 并不是作定语,而是作表语。其前的数词 + 名词短语是形容词 long, wide, old, high 的状语。再如:
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The insect was only 2 millimetres long. 这只昆虫只有 2 毫米长。
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My best friend and I have known each other since we were five years old. 我和我最要好的朋友从五岁就相识了。