At the age of ten,she learnt how to swim
She learned how to swim when she was ten.
When she was ten, she learned how to swim
两个都可以。
句子里的 ten 还可以写成
the age of ten
ten years old
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She learnt to swim when she was ten years old .
When she was 10 years old when she learned to swim 糖糖
When she was ten yeas old,she learned to swim.
she could swim when she was 10