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[数]四进制，四元"XiTong"
1、quaternary food chain───第四纪食物链
2、quaternary structure───[生物物理]四级结构
3、verging system───垂尾XiTong
4、system───n.制度，体制；XiTong；方法
5、quaternary structure of proteins───蛋白质的四级结构
6、quaternary era───第四纪
7、quaternary───n.四；四个一组；adj.[数]四进制的；四个一组的
8、quaternary book───第四纪书籍
9、quaternary period───第四纪
1、The deposit concealed under Quaternary system, and with plenty of underground. water.───铁矿床隐伏于第四系之下，地下水丰富，绝大部分赋存于第四系地层中。
2、The paper reported these fossil strata for research of quaternary system at the region.───通过对这些化石地层材料进行报道，供区域第四系研究之参考。
3、The quaternary system piezoelectric ceramic with good properties and suitable for stationary wave ultrasonic motor is prepared.───制备了性能优良、适合于驻波超声马达的四元系压电陶瓷材料。
4、In Jingyuan region, the Quaternary system developed well, and zoned clearly, and there are complex genetical types.───靖远地区第四系发良良好，分带性明显，成因类型较为复杂。
5、the fault faults from basement to quaternary system , and has the feature of contemporaneous and normal fault.───该断裂自基底一直断到第四系，具同生正断特征。
6、Quaternary System are not developed in eastern Liaonmg.───地区第四系不发育。
7、Jingyuan region, Quaternary system developed well, and zoned clearly, and there are complex genetical types.───靖远地区第四系发良良好，分带性明显，成因类型较为复杂。
8、The equilibrium phase diagram and the density-composition diagram of the quaternary system were plotted using experimental data.───依据实验测定的平衡溶解度数据及对应的平衡固相，绘制了该四元体系的平衡相图及其密度-组成图。