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That's my little brother man, he's only six years old.
他是我弟弟，仅仅6岁。
youdao
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The boy is only six years old. Can you look after him?
这个男孩仅有六岁。你能照顾他吗？
youdao
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The dirty-faced waif was only five or six years old.
这个流浪儿脸上脏兮兮的，只有五六岁大。
《柯林斯英汉双解大词典》
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The dirty-faced waif was only five or six years old.
这个流浪儿脸上脏兮兮的，只有五六岁大。
《柯林斯英汉双解大词典》