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or; otherwise
furthermore; also
「当」 has another reading with different meanings.
行くべきか、はた止めるべきか迷った。
I was torn between whether to go or to stop.
これは偶然か、はた必然か。
Is this coincidence, or is it fate?
彼が正しいのか、はた間違いなのか。
Is he right, or is he wrong?