【英语翻译Wehavenolandethicyet,butwehaveatleastdrawnnearthepointofadmittingthatbirdsshouldcontinuesurvivalasamatterofintrinsicright,regardlessofthepresenceorabsenceofeconomicadvantagetous.能帮我翻译下吗?】

　　英语翻译

　　Wehavenolandethicyet,butwehaveatleastdrawnnearthepointofadmittingthatbirdsshouldcontinuesurvivalasamatterofintrinsicright,regardlessofthepresenceorabsenceofeconomicadvantagetous.

　　能帮我翻译下吗?尤其是ofthepresenceorabsenceof是怎么回事?

　　练习翻译很久了但是感觉自己还是翻译的不成中国话,怎么提高翻译水平呢?