This paper describes a measurement method for experimental estimating oscillation parameter q of hydrogen maser.

Experimental Estimation of Hydrogen Maser's Oscillation Parameter q and Diagnostic Technique of Hydrogen Maser

氢脉泽振荡参数q的实验估算及氢脉泽诊断技术

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In order to supplying the laser source for the 3D optical lattice in our Yb atomic clock experiments, we design an injection-locked Ti: sapphire laser at 759 nm by taking the advantages of the injection locking technique and the Ti: sapphire laser.

为此，结合注入锁定技术和钛宝石激光器的优势，我们旨在实现高功率、窄线宽、频率稳定的注入锁定钛宝石激光源，为冷镱原子光晶格钟的实验研究提供三维光品格光源。

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However, the optical lattice clocks of neutral atoms can simultaneously interrogate a great number of cold atoms in the optical lattice and therefore outperform the single ion clocks for higher stability.

而中性原子光晶格钟能同时探测大量囚禁在光晶格中的原子，其稳定度远远高于离子光钟。

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Optical lattice clock based on neutral atoms with high accuracy is regarded as one of the candidate of next generation frequency standard, and is widely studied in recent years.

中性原子光晶格钟作为一种高精度原子钟，被视为下一代频率基准的候选研究对象，受到人们的广泛关注。

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BeiDou is the world's fourth navigation satellite system, with the others being the US' GPS, Russia's GLONASS, and the European Union's Galileo.

北斗是全球第四大导航卫星系统，其他三大系统分别是美国的全球定位系统，俄罗斯的格洛纳斯系统以及欧盟的伽利略定位系统。

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Building on a Soviet-era foothold, Russia is expanding its monitoring stations for Glonass, its version of the Global Positioning System.

俄罗斯正在以一个苏联时代的驻扎点为基础，为他们的格洛纳斯系统（Glonass）拓建观测站，这是该国自行开发的全球卫星定位系统。

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It will be the fourth global satellite navigation system after GPS, GLONASS and Galileo.

这将是继GPS（美）、格洛纳斯（俄）和伽利略（欧）之后的第四个全球卫星导航系统。

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Building on a Soviet-era foothold, Russia is expanding its monitoring stations for Glonass, its version of the Global Positioning System ( GPS).

建立在苏联时期的据点，俄罗斯正扩展其格洛纳斯监测站，俄罗斯的全球位置测定系统。

六级真题- 2016年 12月 2卷 信息匹配

On this basis, a variety of complex topography simulation test has been carried on, and each wheel slip rate can be efficiently controlled. The ability of climbing, cross obstacle and ravines have been strengthened effectively.

以此为基础，对多种复杂地形进行了仿真试验，该模型可高效控制各轮滑转率，增强了巡视器的爬坡能力、通过沟壑以及跨越障碍的能力，适用于巡视器的工程应用条件。

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The traction control model based on wheel slip model was put forward based on the kinematic model of six-wheeled rocker rover, and can be solved by the linear quadratic optimal control method.

基于六轮摇臂巡视器运动学模型，建立了基于车轮滑转动力学模型的牵引控制模型，并利用线性二次型最优控制法对其求解。

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In January, Chang'e-4, a Chinese robotic spacecraft including a small rover, became the first ever to land on the far side of the moon.

1月，中国的嫦娥四号机器人探测器携带一台小型巡视器历史上首次在月球背面着陆。

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With the implementation of the 2nd stage of Chang' e project, lots of simulation experiments are needed for the development and exploitation of Lunar Rover.

随着嫦娥二期工程正式实施，在月面巡视器的研制与开发中，前期的各种仿真实验必不可少。

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Influences Analysis of Moon Surface Terrain on the Rover Antenna Direction

巡视器对地指向受月表地形的影响分析

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A rover will be released after the landing to conduct scientific exploration.

着陆后，巡视器将开展科研探测。

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Pang said it is the first time that the office confirmed plans to build a cargo spaceship, which is vital for long-term space missions.

彭询元表示，这是首次证实，该厅计划建造一个货运飞船，这对于长期的空间飞行任务至关重要。

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The more in cargo ship carries, the more cost efficient it is, and the more it can contribute to space exploration.

货运飞船运载的货物越多，成本效益就越高，对太空探索的贡献也就越大。

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Tianzhou cargo ships have been delivering all kinds of supplies to China space station, from food to clothes, including space suits.

天舟货运飞船一直在向中国空间站运送各种物资，从食物到衣服，也包括宇航服。

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For example, if Chinese scientists want to do some large scale experiments, they can deliver the equipment by cargo spacecraft.

举个例子，如果中国科学家想做一些大规模的实验，他们就可以通过货运飞船运送设备。

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After a one-month visit, the spaceX cargo ship was released by astronauts from the international space station using a robot arm.

这艘美国太空探索技术公司的货运飞船在国际空间站执行了一个月的任务后，由宇航员用机械手臂送回地球。

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After that, a manned spacecraft and cargo spacecraft will travel between the space station and the Earth to provide supplies.

此后，载人飞船、货运飞船将在空间站和地球之间往返、进行补给。

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