someone

alguien

alguien, tal, uno; personaje

Ex: Someone familiar with the terminology of the subject that the index covers will find the index easy to use.
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*at someone else's expense = a cuenta de otro, a costa de otro, a expensas de otro
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*on behalf of someone else = de parte de otro
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*someone else = otra persona

= alguien
Ex: Someone familiar with the terminology of the subject that the index covers will find the index easy to use.
----
* at someone else's expense = a cuenta de otro, a costa de otro, a expensas de otro
* on behalf of someone else = de parte de otro
* someone else = otra persona