四分的

A stringed instrument played with a bow, having four strings tuned at intervals of a fifth

用弓演奏的一种弦乐器，具有在第五音的音程上调音的四根弦和不分格指板，形体较古提琴浅

Framing shadowgraphy of UV laser probing with the 4th harmonic Nd-YAG Laser was developed for the diagnosis of Z-pinch plasmas. This system can effectively shield visible light and has advantages of high temporal resolution,large optical angular aperture and wide measuring range.

采用Nd-YAG激光器的四倍频激光(266nm)设计了激光探针分幅阴影成像系统，该系统具有时间分辨率和收光效率高，测量范围大，可有效屏蔽可见光干扰的优点，在钨丝阵实验中成功获得晚期内爆等离子体的分布图像。

Because Betelgeuse is expanding in size while losing mass, its density has become very low: the star is now about a billion times less dense than the air on Earth.

由于参宿四的体积在不断扩大，质量却在不断减少，其密度最后变得非常小：目前的密度是地球上空气的十亿分之一。

Townes, who turns 94 in July, plans to continue monitoring Betelgeuse in hopes of finding a pattern in the changing diameter, and to improve the ISI's capabilities by adding a spectrometer to the interferometer.

在参宿四质量流失的过程中，其体积处于膨胀状态，密度也变得非常低，目前这颗恒星的密度仅是地球空气密度的10亿分之一。

Ta group: After retinal vein was occluded by the same method used as above, a venipuncture is performed in the locations away from the occluded site about 2/3 to 1 PD distance, a 20G needle tip was used to puncture the retinal vein and underlying retina and the Bruch s membrane.

2手术方法：局部麻醉，标准三切口扁平部玻璃体切除术，术中作玻璃体后界膜的剥离和切除。在四象限视网膜分枝静脉距视盘2一3PD选定的吻合部位，预做局部视网膜光凝，切开静脉管壁和其下的视网膜和Bruch's膜，气/液交换，12%CZF。

The four color separations through print, film, such as graphic dot over to the printing plate for as little as possible, dot gain 3 per cent to 5 per cent of the dot is not lost, not 5％ website surplas 95％-98 per cent of dot dot not paste version, burliness, students'rooms with ideas for the granula round, there is no dot is white, Burr, gradient hiberarchy rich and clear.

分色的四色软片堵住晒版，不兵图文网点迁徙到印版上，请求网点放不小只管即便多，3％～5％网点不迷失，5％的网点不放不小，95％—98％的网点不糊版，网点单弱，点子颗粒方侧参差，网点操纵白点、毛刺外，阶调条理丰裕、澄辉。

The first 10 chapters study cohomolgy of open set in Euclidean space,treat smooth manifolds and their cohomology and end with integration on manifolds.

全书分四章：范畴与函子及其在模论中的应用；特殊模与相应的维数；环模复形的同调理论；谱序列。

In addition, the thesis has given a detailed introduction and analysis on the concept, historical evolution and development reason of American Common Fund as well as the reason, development process and existing problems of China's security investment fund.

全文共分四章：第一、二章论述了证券投资基金在国外成熟市场和我国的发展历程及发展原因，论述了我国发展证券投资基金的意义及其发展中所面临的问题。

In the forth chapter, by employing the comparison theorem in theory of difference equations together with pure analysis, we get sufficient conditions for permanence of a class of ratio-dependent discrete system.

第四章运用差分方程理论中的比较定理和纯分析的方法得到离散系统持久性的充分条件。

Two framework have been investigated carefully and presented in this thesis. The 18O(1D) reaction with cyclopropane has been investigated using the eletron impact ionization based universal crossed molecular beam techniques.

在环丙烷与单重态氧原子反应的实验中，反应产物经由飞行时间谱的测量，至少有四个反应通道被发现，分别是氢原子形成，氢分子( H2)形成，乙烯( C2H4)形成以及氢氧基形成的过程。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。