【纺织；造纸】变平（平滑的）

flattening

flattening

flattening test of metal【材】

flattening factor for the earth【天】;oblateness of the earth【天】

smoothing (flattening)

dynamical flattening【天】;dynamical oblateness【天】

polar flattening【天】;polar oblateness【天】

flattening of affect