"Two point five" in Engpsh.
This expression comes from the decimal representation of a number. In decimal system, the number 2.5 is represented by 2 and a fraction of 5/10.
Examples in Engpsh:
"My score is two point five out of five."
"The temperature outside is two point five degrees Celsius."
Examples in Chinese:
"我的分数是五分中的二点五分。"
"外面的温度是摄氏二点五度。"