effective size of grain

例句：

1. 1. The engineer calculated the effective size of the grain to determine the optimal feeding rate.
   工程师计算了谷物的有效粒径，以确定最优的投喂率。
2. 2.The effective size of the grain is a critical factor in determining the efficiency of the milling process.
   谷物的有效粒径是决定磨粉过程效率的关键因素。
3. 3.The effective size of the grain can vary depending on factors such as temperature and humidity.
   谷物的有效粒径可以根据温度和湿度等因素变化。