felicitation
n. 慶祝,慶賀
1. (usually plural) an expression of pleasure at the success or good fortune of another;
2. the act of acknowledging that someone has an occasion for celebration
Sincere felicitation on your completing the postgraduate course and receiving the doctorate of science.
衷心祝賀你修完研究生課程並獲得理學博士學位.