Core holes should be drilled as vertical as possible.
取芯井应该尽可能垂直钻探。
The black holes sink to the centre of the cluster, where a core that is completely made of up of black holes forms.
黑洞向星团中心沉降，在这个区域，形成了一个完全由黑洞组成的核心。
In the core, the black holes experience a range of interactions, sometimes forming binary pairs and sometimes being ejected from the cluster completely.
在星团核心，黑洞经历一系列相互作用，有时形成双黑洞，有时被完全抛出星团之外。
The core has a high index of refraction, whereas the surrounding cladding, with its air holes interspersed with silica, has a lower index.
核心的石英折射系数高，环绕在外的外层石英与孔洞交错，所以折射系数较低。
After the simulation, the relationship of fundamental mode loss with the core index, wavelength and the diameter of cladding air holes is given.
通过模拟，给出基模损耗同芯折射率、光波长和包层空气孔直径之间的一般规律。
The small formation holes in the brush cover was constructed with the mold core in moving and static container, and center ingate was employed to the gating system.
针对电刷端盖压铸件结构及工艺要求，选择端盖口部大端面为动静模分型面，铸件上各成形小孔由动静模型芯对接组成，浇注系统采用中心浇道。
He has prepared a special core sand and solved the problem of cleaning blind holes successfully.
配制了专用芯砂，成功地解决了异型盲孔的清砂问题。
I have holes throughout, from back to front and top to bottom to core. More nothing than something within, and yet I still hold water. (a sponge).
从前面到后面、从上面到下、从里面到外面，我全身上下都是洞。空心的地方多过实心的地方，但我还是抓得住水。(海绵)。
All black holes are formed from the gravitational collapse of a star, usually having a great, massive, core.
所有的黑洞都是因为恒星的引力坍缩而形成，这种恒星通常有一颗巨大而厚重的核心。
The jet flows from vent holes in a center-core igniter strongly influence the process of ignition in guns.
中心点火管传火孔射流场直接影响火炮膛内的点火传火过程。
In experiment, output modes of hundred-micron core diameter fiber laser are controled by the hole in the laser cavity, and the effects to beam quality are researched with holes of different diameters.
实验中，采用腔内小孔法对百微米芯径光纤激光器的输出激光模式进行控制，研究了不同孔径对输出激光光束质量的影响。
The variation rules of coupling-length with both wavelength and air holes have been found:for a given twin-core photonic fiber, coupling-length decreases with increasing wavelength;
分析了耦合长度随光波长、孔半径变化的一般规律；当双芯光子晶体光纤的结构一定时，耦合长度随波长增大而减小；
Oblong leather-belt holes on the card frame and the card-core frame are symmetrical and parallel, and has certain radian; a back face of the card-core frame is provided with the card buckle 3.
卡框及卡芯框上的长方形皮带孔对称并且平行，且有一定的弧度，卡芯框的背面装有卡片扣3。
Oblong leather-belt holes on the card frame and the card-core frame are symmetrical and parallel, and has certain radian; a back face of the card-core frame is provided with the card buckle 3.
卡框及卡芯框上的长方形皮带孔对称并且平行，且有一定的弧度，卡芯框的背面装有卡片扣3。
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