can't be helped
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電車が遅れたのなら、仕方がないですね。
If the train was delayed, it cannot be helped.
雨だから中止でも仕方がないです。
Since it is raining, it cannot be helped even if it is canceled.
忘れてしまったのなら、もう仕方がない。
If you forgot it, then there is nothing more to be done.