At the bottom of this plate, an aperture had been pierced exactly similar to the orifice of a letter box.
在那铁皮的下方，开了一个口，和信箱的口完全同一样。
2
Clearly, the effect of this must be taken into account when the orificeplate dimensions are determined.
显然，这种效果，必须考虑到当孔板方面的决心。
3
This paper presents the significance and method of correcting the sharpness of standard orificeplate and gives some suggests for carrying out this work.