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；
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。
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