短语词组短語spin - decoupling 自鏇–自鏇解耦spin decoupling difference spectroscopy 自鏇去偶差譜proton homonuclear spin decoupling 質子同核自鏇去偶proton spin decoupling 質子去偶selective spin decoupling 選擇性自鏇去偶 返回 spin decoupling