ten years old意思是：10岁大，用法上要跟在系动词be后面做句子的表语，例如The boy is ten years old.ten-year-old意思是说：10岁大的，用法上要放在名词前面做这个名词的定语，例如He is a ten-year-old boy.
ten-year-old相关例句
I have a ten-year-old in school.
我有个十岁的孩子在上学。
The child she is looking after is a ten-year-old boy.
她照看的那个孩子是个10岁的小男孩。
One day, ten-year-old Alice asked Carroll to tell her a new story.
一天，十岁的爱丽丝让卡罗尔给她讲一个新故事。
ten years old相关例句
He is ten years old.
他十岁了。
It was so challenging for me because I was only ten years old.
这对我来说太有挑战性了，当时我只有十岁。
When you are ten years old, you may ask me about it, and I will tell you.
当你十岁的时候，你可以问我这件事，我会告诉你的。
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