We must protect primary farmland, keep the area sown to grain stable, improve the structure of grain varieties grown and increase the per unit area yield of grain.
要保护好基本农田，稳定粮食播种面积，优化粮食品种结构，着力提高粮食单产。
The quality of rice grain is characterized by the component, structure and accumulation of starch.
水稻稻米淀粉的组成、结构与积累是稻米品质与产量的决定因素。
The structural features of an alloy (e. g., grain and phase structure) that are subject to observation under a microscope.
在显微镜下观察到的某合金的结构特征(例如：晶粒和相的组织结构特征)。
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