潮水在沙上留下了波洑沙纹。
通过一托浅滩时，要一直测深校时水深及海面下多变的沙纹。
When passing One Fathom Bank, check the depth and variable sand waves below the sea level all the time by echo sounder.
海滨地区广泛存在涡动沙纹，它很大程度上决定着波浪衰减和泥沙运动。
Vortex ripples widely exist in coastal area and greatly control the attenuation of wave and movement of sediment.
采用数值模拟的方法研究了沙粒冲击角对风成沙纹形成过程及其形态特征的影响。
We studied the effect of particle impacting-angle on development of aeolian ripples using numerical simulation method.
采用数值模拟的方法研究了沙粒冲击角对风成沙纹形成过程及其形态特征的影响。
Shape characteristics of the natural aeolian sand ripples and their relations with the physical characteristics of surface sand. ;
通过简单的跃移模型、蠕移模型和稳定模型对风成沙纹的形成过程进行了二维数值模拟研究。
Based on the saltation, creeping and stability models, a two-dimensional numerical model is established to study the development process of aeolian ripples.
风成沙纹的数值模拟研究已取得了不少进展，但各家所采用的模拟方法及模拟结果存在不少差异。
We studied the effect of particle impacting-angle on development of aeolian ripples using numerical simulation method.
沙三段下部优质烃源岩常常呈纹层结构，主要由富有机质的碳酸盐纹层和粘土纹层组成。
The high-quality source rocks of the lower formation of Es_3, usually with laminated structure, are primarily composed of carbonate laminas and clay laminas with rich organic matter.
中粘要求：适用于不锈钢粗纹磨沙板、雪花板、铝塑板（细纹）、塑钢、铝型材和聚脂板材等产品。
Medium adhesion: suitable for coarse-grained stainless steel plate, PVC profile, polyester plate, fine-grained ground plate etc.
中粘要求：适用于不锈钢粗纹磨沙板、雪花板、铝塑板（细纹）、塑钢、铝型材和聚脂板材等产品。
Medium adhesion: suitable for coarse-grained stainless steel plate, PVC profile, polyester plate, fine-grained ground plate etc.
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