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trial; test
「験」 has other readings with different meanings.
新しい方法を験として試してみよう。
Let's try the new method as a test.
験を重ねてようやく成功にたどり着く。
After repeated trials, I finally achieved success.
この薬の効果は験で確かめる必要がある。
The effectiveness of this medicine needs to be verified by testing.