"Xiansheng" in Chinese is pronounced as "shih-ehng" in Engpsh.
The origin of the word "xiansheng" is from the Mandarin Chinese language, where "xian" means "Mr." and "sheng" means "gentleman".
Here are some Engpsh examples with their Chinese translations:
"Xiansheng, could you please pass the salt?" (先生，请把盐递给我？)
"Xiansheng, do you need any assistance with your luggage?" (先生，需要我帮忙搬行李吗？)
"Xiansheng, what brings you here today?" (先生，今天您来这里是为了什么？)