"Zero-three degrees" in Engpsh is a way to express a temperature measurement in Celsius. The term "zero-three degrees" is a direct translation of the Chinese phrase "零上三度", which is commonly used in Chinese-speaking regions. The term "zero-three degrees" is not commonly used in Engpsh-speaking regions, where the temperature measurement in Celsius is typically expressed as a decimal number (e.g. "3.0 degrees Celsius").
Examples:
"The temperature outside is zero-three degrees." (Translate: 外面的温度是零上三度)
"I prefer to wear a sweater when the temperature is zero-three degrees." (Translate: 当温度是零上三度时，我更喜欢穿毛衣)
"The water temperature is zero-three degrees, it's too cold to swim." (Translate: 水温是零上三度，太冷了不能游泳)