grain size frequency-diagram

例句：

1. 1. The grain size frequency-diagram helps us understand the distribution of different types of grains in the field.
   谷物大小频率图帮助我们了解田间不同种类谷物的分布情况。
2. 2. The grain size frequency-diagram is used to analyze the yield of crops.
   谷物大小频率图用于分析农作物的产量。
3. 3. The grain size frequency-diagram shows that the proportion of small grains is increasing.
   谷物大小频率图显示，小粒谷物的比例正在增加。