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even (e.g. even a child)
as long as (it is, you are, etc.); (if) only; just
専門家でさえ分からない問題だ。
It is a problem that even experts cannot understand.
彼でさえ解けなかったんです。
Even he could not solve it.
この程度の問題でさえ難しい。
Even a problem of this level is difficult.