When extended to five dimensions, it becomes a "black string," and unlike a normal 4d black hole, it is unstable (this ignores the fact that 4d black holes eventually evaporate).
当黑洞扩展到第五维度，它就变成“黑弦”。和正常的黑洞不同，黑弦很不稳定(这里忽略了四维黑洞其实最终会蒸发)。
Originally they were round pieces of metal with a hole in the center, so that a piece of string could keep them together.
最初它们是圆圆的金属片，中间有一个洞，这样一根绳子就可以把它们串在一起。
Two tins, connected with string fixed through a hole in the bottom of each tin and stretched tight, form a good telephone over a few yards.
用一根连线把两个罐头盒串起来，线的两端各自固定在每个罐头盒底部的小孔上，拉紧以后，就做成了相距几码远的很好的一部电话机。
1 - he crept down into his hole, pushed the goose egg out of the way, and returned with an old piece of dirty white string.
坦普顿悄悄爬进洞里，一点点把鹅蛋推出来，再拽着一根破旧的白线回到原处。
The gas lift valve on the conventional gas lift pipe string is easy to fail and cannot be replaced in the hole.
常用的气举采油管柱存在的问题是气举阀易失效，不能投捞进行更换，严重影响管柱的效率和使用周期。
It is a very important technical question whether water injection string can rely on string weight to go through the well hole or not.
注水管柱能否靠自重下放到井底是一个十分重要的技术问题。
The anchoring or set to the artificial bottom hole of the separate injection pipe string has solved the creep of the pipe string resulted from the unstable water injection pressure.
分注管柱实施锚定或支撑到人工井底，克服了管柱因注水压力不平稳等原因造成的管柱蠕动现象；
The construction of P202-2H well is hard due to long horizontal hole section and large string friction. High safety coefficient for strings in construction is required.
2H井施工难度大：水平井段长，管柱摩阻大，对施工管柱要求安全系数高；
In the light of characteristics that horizontal hole possesses a certain rate of curvature, the method of estimating minimum axial force at any point along a rod string is established.
针对水平井井眼具有一定曲率的特点，建立了抽油杆柱下部任意一点最小轴向力的计算方法。
The author discussed some key techniques in auger string hole straightening.
作者讨论了螺杆钻纠斜的几个关键技术问题。
And the equation for calculating the maximum deflection of the casing string in a horizontal hole can be obtained...
由此模型可得到水平井套管最大挠度的计算公式。
The results in this paper can be practically used for pipe string design and operational parameter selection for HPHT deep well down hole operations.
本文研究的结果对于高温、高压深井井下作业管柱的合理设计和作业参数的合理选择等具有较大的实用价值。
I've got it! I finally reconciled the black hole information paradox with my theory of string-network condensates!
我成功了！我终于用基于弦网冷凝物的理论，解除了黑洞的信息悖论！
Although most of kicks occur when pulling the drill string from the hole, it is also possible for kicks to occur while tripping in.
尽管大多数井涌都发生在起钻的时候，但下钻的时候也会发生井涌。
A mill is usually used to remove junk in the hole or to grind away all or part of a casing string.
铣鞋通常用于除去井下的碎屑或者研磨掉整个或部分套管。
The separated layer polymer injection pipe string consists of well-flushing packer, down-hole flow distributor and bottom ball.
分层注聚管柱主要由可洗井封隔器、配注器及底球组成。
The tangency point of Bottom Hole Assembly is located at where the drill string just touches the wall of the borehole, and the contact force is zero here.
在计算底部钻具组合的受力和变形时，以前一般都是按弯矩为零的条件来确定其上切点的位置。
The tangency point of Bottom Hole Assembly is located at where the drill string just touches the wall of the borehole, and the contact force is zero here.
在计算底部钻具组合的受力和变形时，以前一般都是按弯矩为零的条件来确定其上切点的位置。
应用推荐