sy = dst_height / roi_height
3.5 毫米耳机接口不支持高阻抗耳机
，这一点在新收录的资料中也有详细论述
Camera Features。新收录的资料是该领域的重要参考
(As an aside, should schools encourage students to use “standard” English? Maybe not, since it’s unfair for society to reward people for growing up in higher-class homes. Or maybe so, since—unfair or not—if that’s the reality, it benefits the individual student to adapt to it.)