square millimetre meaning in English

平方毫米

At - 6c the average sizes is 0 . 256 square millimetres
处于摄氏零下六度的温度下,它们平均有0 . 256平方毫米
At - 3c the average size of snow crystals can be as big as 0 . 811 square millimetres
在摄氏零下三度,雪花的大小增加至0 . 811平方毫米
At - 24c the average size is 0 . 034 square millimetres . at - 18c , the average sizes is increased to 0 . 084 square millimetres
在摄氏零下十八度,雪花的大小增加至0 . 084平方毫米
According to a research , when the temperature is - 36c , the average size of snow crystal is 0 . 017 square millimetres
这时它们是看不见的.在摄氏零下二十四度,雪晶的大小是0 . 034平方毫米