China introduced its so-called one-child policy in the late 1970s.

The one child policy is largely to blame.

而这种现象的背后，很大的一个原因是计划生育政策。

China's One-Child Policy and the Empowerment of Urban Daughters

中国的计划生育政策与都市独生女的赋权

Why China urgently needs to change its birth control policy.

为什么中国急需改变计划生育政策？

Parity-Intensification Effect: Birth Planning Policy and Sex Ratio at Birth in China

胎次-激化双重效应：中国生育政策与出生性别比关系的理论构建与实证研究

What do you reckon the birth control policy?

你如何看待计划生育政策？

English Grammar Guided by the Dialectical Materialism

辩证唯物主义在英语语法教学中的实践

The Chang' E-1 Lunar Orbiter ( CE-1) took Microwave radiometer of four channels ( 3.0,7.8,19.35,37GHz). One important task of CE-1 is for detecting the thickness of the lunar regolith though the measured brightness temperature from the CE-1 microwave radiometer.

我国嫦娥一号探测卫星搭载了四个通道（3.0,7.8,19.35,37GHz）的微波辐射计，其中一个重要任务是通过多通道微波辐射亮温反演整个月球表面月壤厚度的分布。

In the previous lunar exploration activities, the thickness of lunar regolith is allalong concerned by scientists.

在以往的月球探测活动中，月壤厚度一直都是科学家关注的对象。

Helium-3 in Lunar Regolith

月壤中的氦-3

Methods and advances in research on lunar soil thickness

月壤厚度的研究方法与进展

A Preliminary Study of the Dielectric Properties of Lunar Soil Simulants

模拟月壤微波介电特性的初步研究

The pressuresinkage model and shear model of the lunar rover passing on lunar surface were described.

描述了月面探测车辆行驶下的月壤承压特性模型与剪切特性模型；

After comparing the inverse results from different method, RT method is chose to estimate the thickness of lunar soil.

又因DGF方法比较适用于严格分层媒质，而月表并非严格双层结构，因此在月壤厚度评估中，选用RT方法对月壤厚度进行评估比较合适。

Design and Dynamic Characteristic Research of Month Soil Sampling Mechanical ARM

月壤采样机械臂设计及动态特性研究

Research on Lunar Soil Analysis Based on Multi-spectral Image Fusion and Target Classification of Neural Network

基于多光谱融合和神经网络分类的月壤分析研究

This paper investigates the effects of moisture content and gradation on the mechanical properties ( e.g.strength parameters, deformability) in TJ-1 lunar simulant.

为此，开展了含水率及颗粒级配对TJ-1模拟月壤力学性能影响的试验研究。

Based on the correspondence of the DEM and lunar regolith layer thickness, and employing the physical temperature distribution over lunar surface, brightness temperature of lunar regolith layer is numerically simulated by a parallel layer model using the fluctuation dissipation theorem.

依据月球表面温度分布以及由DEM对应构造的月球表面月壤厚度，由起伏逸散定理，模拟计算了3,7.8,19.35,37GHz四个通道平行分层月壤微波辐射亮度温度的月球表面分布。

The interaction between a rigid wheel and lunar soil simulant

刚性轮与模拟月壤相互作用初步研究

At first, the physical and mechanical properties of the stimulant lunar soil are studied through laboratory tests.

首先对月壤和常用模拟月壤的物理力学性质进行了总结归纳，通过室内试验研究了本文所用合成月壤的基本物理力学性质，并与月壤进行了比较，对合成月壤进行了评价。

The sampling device controlling system is to take lunar soil into the heating equipment automatically in the control of digital signal processor.

取样臂控制系统是通过信号处理器自动控制电机来驱动取样装置掘取月球表面土壤，并最终将采集的月壤送入加热设备的过程。