If someone or their conduct is culpable, they are responsible for something wrong or bad that has happened.
Their decision to do nothing makes them culpable.
他们不采取任何行动的决定使他们难辞其咎。 culp= fault 错, 罪 culpability n. 有罪；有过失
culp 错，罪 + ability 状态 → 有罪；有过失
culpable adj. 有罪的；应受指责的
culp 错，罪 + able …的 → 有罪的；应受指责的 culprit n. 犯人
culp 错，罪 + rit → 犯人 exculpate v. 无罪释放
ex 出 + culp 错，罪 + ate 做，造成，使… → 从罪中解脱 → 无罪释放 inculpate v. 归罪
in 使… + culp 错，罪 + ate 使… → 使〔别人〕有罪 → 归罪
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