With the increase of doped tungsten, the average particle size of its primary grain gets smaller.

随着掺钨量的增加，其一次颗粒的平均粒度显著变小。

youdao

The results show that, increasing cooling rate, pre-deformation and grain refinement are useful for spreading of the non-equilibrium microstructure around the primary grains.

结果表明：增加冷却速率、预变形处理和晶粒细化有利于初始凝固组织中存在的非平衡组织的分散细化。

youdao

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。

youdao

The region stands astride the primary corridor for the Midwest grain trade and sits in the middle of the Gulf trade routes.

FORBES: The Katrina Effect: Renaissance On The Mississippi