sighn.叹气；叹息v.叹息；惋惜sigh in sorrow悲嗟sigh in despair唉声叹气sighing dyspnea[医] 叹息式呼吸困难sigh with relief宽慰地舒一口气sighs and groans长吁短叹sigh for a house渴望房子sigh forth sth.叹息中说出某事sigh with emotion感慨sighal replacement信号更换sigh for something为某事而叹息