How to understand the sentence "Jiang Zuobin was unmoved, ended his speech calmly and walked off the stage with his head held high"?

A: "Being unmoved" shows that Jiang Zuobin firmly believes that Chinese should have a place in UN meetings; "Being as cool as a cucumber" shows that Jiang Zuobin has a good psychological quality-he doesn't panic in case of emergency; "Hold your head high" describes Jiang Zuobin's pride and confidence as a China native.