求翻译：瑞芬太尼作为一种新型镇痛药[2,4]，因结构中含有酯键易被血浆和组织中酯酶代谢，而具有起效快、清除快等特点，药代学特点很适于临床输注给药，不论输注时间长短停药后药效能够很快终止，而不需考虑术后恢复延迟问题，瑞芬太尼的应用将为静脉麻醉带来更为广阔的前景。理论上讲，瑞芬太尼是一种纯粹的u受体激动剂，具有良好的镇痛作用；有研究提示，瑞芬太尼同样具有良好的镇静作用，目前，已在ICU镇静中运用越来越广泛。是什么意思？

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Auspicious fragrance too Nepal takes one kind of new analgesic [2,4), because in the s

Remifentanil as a new analgesia drug [2,4], due to structure in the contains ester key easy was plasma and organization in the ester enzyme metabolism, and has up effect fast, and clear fast, features, drug generation learn features is for clinical lose note to drug, regardless of lose note time len