The lowermost mantle layer is above the core mantle boundary (CMB) and composed of D" region and ultra-low velocity zone (ULVZ)."
地幔底层由具有高地震波速和高密度的D″区和超低速带（ULVZ）组成。
The horizontal low velocity layer, the vertical low velocity zone and the high velocity layer in the basement of the lower crust are related to the ore_forming processes.
文中还探讨了中国大陆主要成矿域岩石圈的现今活动性，以及地壳厚度、壳内低速层、“墙式”地震剪切波垂向低速带和下地壳底部高速层（体）的分布特征以及与成矿作用的关系。
The geothermal anomaly, low velocity zone and high conductivity layer in crust, and frequent occurrence of strong earthquakes show that the study area is an active area of modern tectonization.
地热异常、地壳内存在低速层和高导层、强烈地震频繁发生等现象说明，这一地区是现代构造运动的活动区。
The most remarkable feature of the upper mantle is the low-velocity zone. as suggested by its name, this is a region in the upper mantle in which there is a decrease in the speed of seismic wave.
上地幔一个最显著的现象就是低速带，就像这个词名所表达的那样，在上地幔存在这么一个区域，在那里地震波波速会发生减慢。
The asthenosphere corresponds approximately to the low - velocity zone.
软流圈，大体上相当于低速带。
The zone has the obvious features of low pressure, high saturation of condensate oil, high interfacial tension and high flowing velocity.
该区域明显地呈低压、高凝析油饱和度、高界面张力和高流速的特征；
Refractions which transit the zone will be delayed because of low velocity and attenuated because of transmission loss.
穿过此区的折射因低速而有延迟，又由于透射损失而有衰减。
When working face has mechanized support, air leakage quantity is small, velocity is low in goaf, and spontaneous combustion zone is more approach to working face.
有综采支架时，工作面向采空区的漏风量过小，致使采空区的速度很小，自燃带靠近工作面。
When working face has mechanized support, air leakage quantity is small, velocity is low in goaf, and spontaneous combustion zone is more approach to working face.
有综采支架时，工作面向采空区的漏风量过小，致使采空区的速度很小，自燃带靠近工作面。
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