primary directions meaning in English

一级推进

The primary direction of my research is the study of license plate character recognition , including the pretreatment of license plate image , license plate character segment and character recognition
我的研究方向是车牌的字符识别，具体包括车牌图像的预处理(包括图像二值化) 、车牌字符的分割和车牌字符的识别三大块内容。
In the process of the research on the performances of security investment funds , the factors and indicators of evaluation on the funds are always the leading problem under a lot of argument , and are also the primary direction the methods of evaluation on the performances of security investment funds develop
在证券投资基金绩效研究的发展过程中，评估的因素或指标问题一直是争论最大的一个方面，也是证券投资基金绩效评估方式不断发展所遵循的主线。