前边缘 meaning in English

anterior border
front edge

Leading edge and trailing edge means the function of the dimmer
飞机螺旋桨的前边缘和机翼后边缘是最能够反应调光器的功能的。
Leading edge cuts the front from the the main - voltage sinus after the zero - cross
飞机螺旋桨的前边缘在零交叉只后阻断了高电压的前峰。
In printing , the space surrounding the type area , comprising head , tail , back and foredge
在打印技术中,围绕打字区域的空间,包括头、尾、后部和前边缘。