一般我们说某物一米长，不加-,但是当我们想把"一米长"当作某被修饰的名词的定语来用时,就需要加-来构成复合形容词,此时要注意,符合形容词中的可数名词(如这里的metre)只能用单数形式!
例如:
The
ruler
is
only
a
metre
long
对比
I
have
one
a-metre-long
ruler.
She
has
a
daughter
who
is
only
eight
years
old.
对比
She
has
an
eight-year-old
daughter.
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