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.
There can be many causes of hazy vision. Some examples of common causes are: abrasions to the cornea ; cataracts; corneal opacification (scarring) infectious retinitis ; macular degeneration related to age ; migraine headaches ; optic neuritis ; retinitis pigmentosa ; retinopathy, such as diabetic retinopathy stroke ; trauma or injury to the eyes