This means your neck and spine should be in a neutral position, shoulders and torso relaxed, knees bent at 90 degrees with both feet flat on the floor.
这也就是说你的脖子和脊柱应该处于中正的位置，肩膀和躯干放松，膝盖弯曲呈90度角，双脚平放在地面上。
2
I practised in my own flat first, getting the camera in the right position so that I could be quick.
我在自己的房间里先操练，选好合适的角度，到了别人家里就可以很快地拍摄。
3
We don't want the country to be in a position next year like we were in 2000, in which problems occur, and the public is left flat-footed in understanding the problems and the possible solutions.