1.
Sheets of postage stamps are perforated.
大张的邮票上打有齿孔。
2.
a perforated sheet of stamps
一张打有齿孔的邮票
3.
make a row of small holes(esp in paper)so that it will tear easily
在（尤指纸）上打齿孔（以便撕开）
4.
Advanced feed hole: Refer to sprocket holes of paper tape, which are in line with the leading edge of the code holes. Thus an operator will know if he is loading the tape into the reader with the right end of the tape.
前向齿孔:纸带上和代码孔相并行排列的齿轮孔。操作员从它而知纸带的输入方向是否正确。
5.
involute spline gear shaper cutter
渐开线花键孔插齿刀
6.
The Method of Machining Small Inner Gears by the Y54 Gear Cutting Machine;
利用Y54插齿机加工小孔内齿轮的方法
7.
"They are usually equipped with fixing bolt holes, internal or external gear, lubrication holes and sealing elements."
该产品一般都带有安装孔、内齿轮或外齿轮、润滑孔和密封装置
8.
A tapered, serrated tool used to shape or enlarge a hole.
手钻用来钻孔，或扩大孔的尖细带齿的工具
9.
To shape or enlarge(a hole)with a tapered, serrated tool.
凿孔扩大用带齿的尖的工具钻或扩大（孔）
10.
Application of self-made scarifier anchorage boring in construction
自制松土齿在锚孔钻造成孔施工中的运用
11.
involute spline gear shaper cutter with taper shank
锥柄渐开线花键孔插齿刀
12.
The teeth were firmly cemented in their sockets.
牙齿被牢固地粘合在其孔窝内。
13.
chuck for grinding hole and end face of bevel gear
磨圆锥齿轮孔和端面用的卡盘
14.
Design of Modular for Machining of Balance Holes on Gear Pump Side-plank
齿轮泵侧板卸荷孔加工组合机床设计
15.
Lathe Processing Fixture Design for Holes Series of Planetary Gear Frame
行星齿轮架孔系加工的车床夹具设计
16.
Any of the pegs on the platen of a printer, which engage holes at the edges of paper.
（打字机）的齿打字机压纸卷轴上的齿，可在纸沿打孔
17.
a writing implement with a small toothed wheel that cuts small holes in a stencil.
有小齿轮可以在蜡纸上刻小孔的书写工具。
18.
You will see that it has jagged edges.These are called "perforations".
你会看到锯齿状的边缝，这些就叫孔状接缝。