圆和

He investigates geometrical properties of cycloids, epicycloids, and hypocycloids.

他研究了摆线、圆外旋轮线和四点圆的旋轮线的几何性质。

When you cut down a tree and look at the stump, you can see that the wood has lots of dark rings in it. Long ago, the wood dried out and people kept throwing darts at the stump, the wood started to crack from the center to the sides. That is why modern dartboards have rings and lines.

当你把一棵树砍倒后，看看树桩，就可以看到为数众多的深色圆环，当时木头乾掉，人们持续朝树桩射飞镖，木头就会从中间向旁边裂开，这就是为何现代标靶有圆环和线条。

Under it, apparent motions of the planets are to be explained in terms of deferents and epicycles around the earth.

依据此，则将根据饶地球的圆心轨迹和周转圆来解释行星的视运动。在周转圆上的视运动映射属于常态科学的领域。

The article that is based on theoretical knowledge of the discrete math and the computer technique provide numeric stimulate pattern of the flat-faced follower eccentric circle institution, which is applied to resolve the wearing problem of flat-faced follower eccentric circle institution.

本文基于离散数学理论和计算机技术提出了平底从动件偏心圆机构系统磨损的数值仿真模型，可用于解决平底从动件偏心圆机构系统的磨损问题。

Disc around the mouth and has a large number of small sentry post mouth, big mouth post holes for the bass, small mouth post holes for the treble, to the mouth of the disc number of posts are classified as shuang xiang, four-ring, 6 ring, until the 36 ring.

圆盘四周都有一个大哨口和许多小哨口，大哨口为低音孔，小哨口为高音孔，以各圆盘哨口的数量而分为双响、四响、六响，一直到三十六响。

The company has 34 self-carbide grades, specifications more than 4000 models, which Carbide Rods, long thin slices, the overall wafer cutter, glass cutter, woodworking tools and non-standard items, such as finishing a very popular.

公司拥有自主硬质合金牌号34个，规格型号4000多个，其中硬质合金圆棒，长条薄片，整体圆片刀，玻璃切割刀，木工刀具和非标精加工件等十分畅销。

In particular, the enterprise product GB812, GB810, DIN981 nut round production technology and quality leader in China, the company has produced special equipment round nut 58 Units, from hate red hair hit high-frequency heat treatment, the Road, strict production process, quality and stability .

特别是本企业产品GB812、GB810、DIN981圆螺母生产工艺和质量在国内领先，本企业有生产圆螺母专用设备58台，从毛柸红打到高频热处理，各道生产工艺严格把关，质量稳定。

The experimental investigation demonstratesthat (1) the critical perforation energy of pressure pipelines (D/H=15) with pressure OMPa under lateral impact of flat-nose and spherical-nose indenters ranges from 2~3%,the critical perforation energy of empty pipelines is higher 1 ~2% than pipelines filled in water without pressure.

实验研究结果表明：(1)当管梁内注满水，预加工作内压P=0MPa时，对于径厚比D／H=15的厚壁圆管，在平头弹体和球形弹体两种弹体冲击作用下临界穿透破坏能量的降幅在2～3％之间：锥头弹体冲击厚壁空管的临界穿透能量比充水预加内压为P=0MPa的圆管高1～2％：(2)充水管道的预加内压提高，临界穿透能量有一定降低。

Objective:The aim of the experiment is to search for the regulation that the hepatic stem cells abnormally differentiate into cancer cells. In the experiment,the variating regulation of PCNA,c-kit and c-myc in the formation and development of HCC will be interpreted with immunohistochemistry and RT-PCR. So,the initial mechanism that hepatic stem cells abnormally differentiate into cancer cells from the levels of cell,protein and gene will be clarified. The last,the inhibition to HCC with ulinastain will be studied,from which,a new way of clinical prevention and treatment for HCC will expect to be explored.

二、目的本实验旨在探讨以卵圆细胞为代表的肝干细胞在HCC发生、发展过程中在肝组织内分布规律，并通过免疫组化、RT-PCR等技术阐明PCNA、c-kit、c-myc在HCC发生、发展过程中的动态演变规律，从细胞、蛋白、基因三个水平初步研究卵圆细胞向癌细胞异常分化的机制，同时观察乌司他丁对HCC发生、发展的抑制作用，为肝癌的临床预防和治疗探索新的途径。

Prove that the common external tangents of ω1 and ω2 intersect on.

证明：圆ω1和ω2的两条外公切线的交点在圆ω上。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。