Various approaches have been used to improve the performance of adapted indigenous stock, including cross-breeding and upgrading through back-crossing with improved breeds, and within-line selection.
已有多种方法被用于提高地方良种的性能，包括杂交育种，以及通过与良种的回交和品系内选育进行的品种改良。
Firstly, according to crossing traffic image, set up the dynamic prototype selection model of real time information syncretics.
首先，针对交通图像受光线、抖动干扰问题，提出了实时信息融合的动态原型选择模型；
Among those discussed are problems of crossing selected lines to obtain extra responses, and discrepancy of some theoretic results on selection limits.
本文还讨论了不同选择系杂交以获致进一步进展的问题，讨论了长期选择理论研究结果与实际模拟的偏差。
The problems of selection and utilization of parent, setting of crossing, and increasing the origin of genetic composition were further analyzed and discussed in details.
并对亲本选择利用，杂交组合的配置，扩大遗传组成源等方面进行分析探讨。
By means of intervarietal crossing and linear selection, the new rape variety "Youyan No. 1" of low erucic acid and "Youyan No. 2" of "Double Low"(low erucic acid and low glusosiolate) have been bred.
通过品种间杂交和系谱法选择，育成了甘兰型低芥酸油菜新品种“油研1号”和甘兰型“双低”油菜新品种“油研2号”。
To improve traffic safety level and increase the efficiency of crossing facilities, the paper presents a methodology in studying selection preference of pedestrian crossing behavior.
为提高行人的交通安全水平和过街设施的使用效率，研究行人对过街设施的选择行为。
It was also pointed out the key work on the research, such as the crossing parents in the stage of flowering, computer ap-plication and basic research, to upgrade the level of parental selection.
同时也指出了要提高亲本选配水平，必须在杂交亲本的开花、计算机应用和基础研究上努力。
This paper introduced the field selection, field planning, vane production, observation methods, and record format of river-crossing leveling in detail.
详细介绍了光学测微法跨江水准测量方法、场地选择、场地布设、砚板制作、观测方法、记录格式等内容。
The program of the new cotton breeding method of mass selection-mass crossing is described and the results of breeding cotton is presented in this paper.
本文详细叙述了棉花混选—混交新育种方法的程序及其育种效果。
Responses of main characters of upland cotton to mass selection-mass crossing breeding system were studied.
研究了陆地棉主要性状对混选—混交育种体系的响应。
Responses of main characters of upland cotton to mass selection-mass crossing breeding system were studied.
研究了陆地棉主要性状对混选—混交育种体系的响应。
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