In addition , elutriation, growth, shrinkage and reaction act differently for the different - sized particles in the bed. 此外,扬析 、 长大 、 缩小和反应对床层中不同粒度的颗粒所引起的作用也不相同.
The company is in for a period of retrenchment.公司目前正值削减开支阶段.Retrenchment in the colleges could force thousands of students back into the unemployment lines.学院若缩减经费,数千名学生将被迫回到失业工人的行列.Defense planners predict an extended p...