Dangerous mountain, valley, Shanxi, Hebei and between the Wall to build a natural barrier.

Small and shallow as the pool is , It'still makes a natural barrier.

潭不大也不深, 却是横在面前的一道坎.

The Sahara Desert is a natural barrier between North and Central Africa.

撒哈拉沙漠是北非与中非之间的天然屏障.

The Unified Mathematical Model for Cylindrical, Conical and Azimuthal Projections and Comparative Study of Their Application

圆柱投影、圆锥投影和方位投影的统一数学模型及应用比较研究

The basic wave pattern of azimuthal motion and the sensitivity and error of measurement are also discussed in this paper.

根据实验结果，讨论了环向波动基本变化规律以及本实验在测量精度和测量误差方面存在的问题。

Fractured formations show very strong azimuthal anisotropy, causing great difficulties in exploration.

裂缝性地层表现出很强的各向异性，勘探难度很大。

P-wave azimuthal AVO analysis of fracture detection in coalbed and its application to engineering

P波方位AVO在煤层裂缝探测中的应用

Measurements of hard X-ray generated by means of REB in azimuthal magnetic field

强流电子束在角向磁场中产生的硬X射线测量

Forecasting the azimuthal change rate of undrilled borehole and its application

待钻井眼方位变化率预测及其应用

When the azimuthal gap increases, the resonance frequency will move to higher values.

当开口间距增大时，谐振频率将向高频移动；

A study of oblique azimuthal equal area projection of Xinjiang Uygur Autonomous Region

新疆维吾尔自治区斜轴等面积方位投影的研究

Theory on P-Wave Azimuthal AVO and Detecting Technique of Coal Bed Cracks

P波方位AVO理论及煤层裂隙探测技术

Analysis of Azimuthal Instability of Two-Phase Jets by Integral Transformation

用积分变换法分析周向不对称射流的稳定性问题

Analysing stress field before and after Tangshan earthquake with azimuthal feature releasing seismic energy

用地震能量释放的方位特征分析唐山地震前后的应力场

Azimuthal Alignment Method for PM Fiber Based on Light Intensity Distributions with Five Finger Profile

基于五指型光强分布的保偏光纤定轴方法

Proper combination of P and S waves can reduce to certain extent the azimuthal effect.

用P波与S波的某种组合可消除一些方向性影响；

Functions and features of PeriScope 15 azimuthal orientation resistivity measuring instrument

PeriScope15方位定向电阻率测量仪的功能与特点

The azimuthal anisotropy is preliminarily discussed through the full use of the present data.

同时充分利用已有资料对方位各向异性进行了初步的研究和探讨。

Azimuthal magnetic field disturbances and spiral structure of the interplanetary magnetic field

日面方位磁场扰动和行星际磁场螺旋结构

Direct Numerical Simulation of Vortex Rings Disturbed by Azimuthal Bending Wave

受周向扰动的涡环的直接数值模拟

Formation Dip Calculation by Azimuthal Density Image Data

用方位密度成像测井资料计算水平井钻遇地层倾角的方法