例句與造句

1. The Flecto system sander, Blackburn said, has a flat, oscillating plate to which varying grades of sandpaper are attached using a self-stick adhesive.
2. The vorticity, for the oscillating flow near a wall at rest, is equal to the vorticity in case of an oscillating plate but of opposite sign : " ? " 2 =  " " ? " 1.
3. It's difficult to find oscillating plate in a sentence. 用oscillating plate造句挺難的