The double-concave shape of REE patterns of the alkali basalt show that the basalt melt had reached equilibrium or quasi-equilibrium with the garnet and clinopyroxene megacrysts.
碱性玄武岩的双凹型REE配分模式是熔体与单斜辉石、石榴石达到化学平衡或近于化学平衡的结果；
Just as a double convex lens enlarges so a double concave lens reduces.
正象双凸透镜可以放大那样，双凹透镜也可以缩小。
Spherical roller bearings are double-row, self-containing units that comprise solid outer rings with a concave raceway, solid inner rings and barrel rollers with cages.
球面滚子轴承是双列，自我包含的单位，包括坚实的外圈与凹面滚，固体和内圈与辊每桶笼。
The base has special concave design, and can be fixed with double-sided tape.
底板有特殊凹位设计，可以直接用双面胶固定。
Just AS a double convex lens enlarges, so a double concave lens reduces.
正象双凸透镜可以放大那样，双凹透镜也可以缩小。
The technique of fabricating concave gratings in PMMA by double X-ray exposures is described.
介绍了一种通过微细加工技术即二次X射线曝光制作凹面光栅的方法。
Flower petal 5, the tip micro concave, the wild wild rose is a single-lobe, also has the double petals cultivated variety.
花瓣5枚，先端微凹，野生蔷薇为单瓣，也有重瓣栽培品种。
The effects of double-row concave ridge and film mulching on phosphorus content in flue-cured tobacco leaves and soils were studied by field and laboratory experiments.
采用田间试验与室内分析相结合的方法，探讨了烤烟地膜覆盖与双行凹型垄结合对烤烟及土壤磷素含量的影响。
The muscle pulling hook is curved double-head structure, and the expanders for the two end parts are concave curved plates.
肌肉拉勾为曲状双头结构，其两端部的撑开器为内凹的曲面板状。
The concave structure can hold your neck, and give it well protection. The other side of the double-side pillow can be filled with buckwheat shells, chaffs or vacuum cotton etc.
凹槽结构独有设计，增加颈部承托，保护颈椎，双面枕另一面可选择填充荞麦壳、金谷壳、真空棉。
The concave structure can hold your neck, and give it well protection. The other side of the double-side pillow can be filled with buckwheat shells, chaffs or vacuum cotton etc.
凹槽结构独有设计，增加颈部承托，保护颈椎，双面枕另一面可选择填充荞麦壳、金谷壳、真空棉。
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