"9:50" in Engpsh is commonly expressed as "nine fifty" or "quarter to ten."

The origin of this form of time expression is from the way people used to tell time on analog clocks and watches, where the hours were marked by numbers and the minutes were indicated by the position of the hands on the clock face. The practice of using numerical and verbal forms to tell time became widespread and is now a common method used in Engpsh-speaking countries.

Here are some examples of "9:50" in Engpsh:

"I'll meet you at nine fifty."
"The movie starts at quarter to ten."
"Can you be ready to leave by nine fifty?"

And their translations in Chinese:

"我们9点50分见面。"
"电影10点差不多开始。"
"你9点50分前准备好离开吗？"