1.A time is long, or crouch a little while to stand up, can feel giddy, at the moment nigrescent , what symptom be?
座着时间久了，或蹲一会儿站起来，会感到头晕，眼前发黑，是什么症状？
2.Why to sit occasionally long rise is the meeting giddy at the moment nigrescent ?
为什么有时候坐久了起来会头晕眼前发黑呢？
3.Feel suddenly when sicken at the moment nigrescent, showSmokeMist shape, can see black or gules object are before sometimes float move.
患病时突然感到眼前发黑，呈烟雾状，有时能看到黑色或红色物体在眼前漂动。
4.Why to crouch long or sit long when standing up, can giddy head bilges , at the moment nigrescent! Be anaemic cause? How to solve?
为什么蹲久了或坐久了站起来的时候会头晕脑胀，眼前发黑！是贫血引起的吗？怎样解决？
5.Sitting or crouching, why to when rising, meet giddy? And at the moment nigrescent , see not fair thing?
坐着或蹲着，起来时为什么会头晕？而且眼前发黑，看不清楚东西？
6.inadequate picture exposure due to the brightness is too low, it looks nigrescent.
曝光不足的图片由于亮度太低，看上去发黑。
7.Skin course The summer in relief illumination is basked in, skin color hair is yellow, nigrescent , dim without light.
皮肤经过夏季的阳光照晒，皮肤颜色发黄、发黑，暗淡无光。
8.When menstruation comes why is blood red gotten nigrescent ?
月经来的时候为什么血红得发黑？
9.Is there finger in the symptom of chilblain nigrescent ? How beware of?
冻疮的症状里有手指发黑么？怎么提防？。
10.I should crouch only giddy, at the moment nigrescent , want to faint very much! Be how do ah?
我只要一蹲下就头晕、眼前发黑，好想晕倒！是怎么搞的啊？