Zuòwéi zhǔchírén, tā qiǎomiào de kòngzhì zhe quánchǎng de qìfēn.
As the host, she skillfully controlled the atmosphere of the whole venue.
Tips
culture
TV hosts (主持人) are celebrities in China. The most famous include 何炅 (Hé Jiǒng) from 快乐大本营, 董卿 (Dǒng Qīng) from CCTV, and 撒贝宁 (Sā Bèiníng). The Spring Festival Gala (春晚) hosts are household names.
usage
主持 alone is the verb 'to host/preside over': 主持会议 (chair a meeting), 主持婚礼 (host a wedding). Add 人 to make it the person.