For they are efforts at exculpation.

因为这是企图辩解.

Its content mainly includes the confession of a suspect or a defendant to acknowledge a crime and his exculpation to declare himself innocent or guilty of a venial crime.

它的主要内容包括犯罪嫌疑人、被告人承认自己有罪的供述和说明自己无罪、罪轻的辩解。