punch off

A definition of stopping of two-parameter processes at the stopping line is given by using the expression of conditional expectation and some invariances of stopping transformation are discussed.

利用条件期望的表达式给出了两指标过程在停线处的停止定义 ,研究了停止变换下的若干不变性 给出了这种停止意义下的局部平方可积强鞅的定义 ,进一步研究了局部平方可积强鞅二次变差的存在性及其停止性质 ,得到了重要的Burkholder -Davis -Gundy型不等式及平方可积强鞅的一个充要条

The present paper presents the definition of the stopping for two-parameter strong martingale and deals with the stopping properties for two-parameter strong martingale.

利用停线给出两指标强鞅停止的定义 。

paper tape puncher

纸带穿孔器纸带凿孔机

A groove or hole scooped with or as if with such a chisel.

凿孔；凿槽用凿挖出的或象是用这种凿子挖出的槽沟或空穴

fully automatic reperforator switching

全自动复凿孔机交换制

to get liquid from (the trunk of a tree) by making a hole in it

在(树干)上凿孔取液汁

A punching, perforating, or stamping tool, especially one used by a goldsmith.

尤指金匠用的凿孔器

a bit for enlarging the upper part of a hole.

用来扩大凿孔上部的一种钻头。

coupled reperforator and tape reader

复凿孔和纸带阅读两用机

a card on which data can be recorded in the form of punched holes.

能以凿孔形式记录信息的卡片。

to tap maple/rubBer trees

在枫树(橡胶树)上凿孔取树液

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）

an iron block cut with holes and grooves to assist in the cold-working of metal.

一种在金属冷加工中起辅助作用且带有凿孔、凹槽的铁块。

A square-shanked chisel that fits into a square hole in an anvil.

方柄凿一种与铁砧的方孔相吻合的方形柄凿

Pionjar 120 motor drill and breaker

必安凿120钻孔机及轧碎机

To make a hole in or through, with or as if with a drill.

钻，凿，开洞用或似用钻打洞或钻孔

The electrician chiseled a hole in the wall to fit a door bell.

电工在墙上凿了个孔,以便装上门铃。

He chiselled a hole in the door to fit a new lock.

他在门上凿了一个孔, 以便装一把新锁。

Drill jig size calculation of the double inclined holes in the handle of YT 24 rock drill

YT24型凿岩机柄体双斜孔钻模尺寸计算

a board perforated with regularly spaced holes into which pegs can be fitted.

这块板子上面均匀地凿有孔，这些孔可以插钉子。