opengl Z轴显示问题?

Question

当不进行旋转和平移时，画三个轴，Z轴能被隐藏。
但当经过旋转和平移后，Z轴能被隐藏时，Y轴为什么是倾斜的。有没办法Y轴不倾斜？

    glTranslatef(0, 0, -2.0f);

    glRotatef(m_rorate[0], 1, 0, 0);//旋转 绕X轴
    glRotatef(m_rorate[1], 0, 1, 0);//旋转 绕Y轴
    glColor3f(1.0f, 0.0f, 0.0f);
    //glTranslatef(-0.5f, -0.5f, -0.5f);

    glBegin(GL_LINES);
    glVertex3f(0.0f, 0.0f, 0.0f);
    glVertex3f(1.0f, 0.0f, 0.0f);
    glEnd();
    glBegin(GL_LINES);
    glVertex3f(0.0f, 0.0f, 0.0f);
    glVertex3f(0.0f, 1.0f, 0.0f);
    glEnd();
    glBegin(GL_LINES);
    glVertex3f(0.0f, 0.0f, 0.0f);
    glVertex3f(0.0f, 0.0f, 1.0f);
    glEnd();