英语中，没有three
year
olds这个表达，正确书写格式是three-year-olds。
以下是three-year-olds和three-year-old的区别：
1.
three-year-olds的词性为名词，为名词three-year-old的复数形式，意思是：三岁大的人。例如：
These
are
all
three-year-olds.
这些都是三岁大的小孩。
2.
three-year-old
可以是单数名词，意思是：三岁大的人。也可以是形容词，意思是：三岁大的。例如：
她是个三岁大的孩子。
She
is
a
three-year-old.
(three-year-old
为名词）
She
is
a
three-year-old
girl.
（three-year-old
为形容词）
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