round off

1.I rounded off the corners with sandpaper.

我用砂纸把棱角打磨光滑。

2.1415926 gives 3.14 when rounded off to 2 decimal places.

当将3.1415926缩减成2小数时便成为3.14。

3.Take a piece of sandpaper and round off the edges of the frame.

拿张砂纸把框架的边磨圆。