promissory estoppel meaning in Chinese

不得自食其言
允诺后不得否认的原则
允诺禁反言

The third part and forth part are the main body of this paper . the third part includes the legal attribute and characters of demand guarantee , which points out the double legal attributes and later focuses on the primary character of independence , absolution , promissory estoppel and trend of documentation
第三部分是见索即付保函性质和法律特征，首先分析关于其法律性质的几种学说，其次重点研究其独立性本质特征，最后，对比传统的从属性保函，探讨了其表现出的无条件性，允诺禁反言，单据化和表面一致的法律特征。