and that 's occurring about 40 , 45mm per year ,
以每年40到45毫米移动
The temperature field for growing Φ 40 ~ 45mm Nd : YAG crystal was found by studying temperature distribution of crystal growth units .
通过对生长装置的温度分布的研究，确定了生长Φ40～45mmNd：YAG晶体的温场。
45mm