周积

1

屋很小，有一个三角形的屋顶，别的没有什么可看的，四周积有五英尺高的垃圾，像肥料堆。

It was of small dimensions , with a peaked cottage roof , and not much else to be seen , the dirt being raised five feet all around as if it were a compost heap .
2

轴流压气机三维叶片周向积叠的多目标优化

Multi-objective Optimization of the Circumferential Stacking of Axial Compressor 3D Blades
3

燃气涡轮叶栅的周向积叠规律优化设计

Optimization Design on Tangential Stacking Law of Gas Turbine Cascade
4

硫酸处理时间在4.5小时以内是安全的，3小时的硫酸处理种子4周的层积显示出10日内90%的最高发芽力；

Sulfuric acid treatment up to 4.5 hours was safe . The seeds treated with 3 hour sulfuric acid and then 4 week stratification showed the highest percent germination energy 90 % for 10 days .