The first day of school in the China falls on 1 September, or the first Monday following if September 1 is a Friday, Saturday, or Sunday. In northeastern China, schools open on Monday in mid-August after summer vacation.
3) Improper heating profiles setting lead to unbalanced heating zones temperature inside heating furnace, which causes uneven glass temperature on both different parts of the glass sheet and between the top and bottom glass surfaces, thus may brings irregular white haze on glass surfaces.
The cataract is a lens that has become clouded. Cataracts occur when there is a build-up of protein in the lens that makes it cloudy. This prevents light from passing through a normally clear lens, causing some loss of vision. No one knows what causes the build-up of protein responsible for clouding the lens.