protective layer造句怎么写

The weight of these tubes holds the protective layer in place, while the gaps between the tubes permit the overspill to escape.

One of the most disturbing aspects of the changes in Earth is the rate at which chemical pollutants produced by human activity are destroying the protective layer of ozone in Earth's upper atmosphere.

One reason for the rise in sunburn could be the hole in the ozone layer - the protective layer that shields the Earth from the sun's harmful ultraviolet rays.

White protective layer formation, long-term protection of the teeth, reduce plaque regeneration.

Then they often follow that with a sprinkling of dust to create a protective layer of dirt on their skin (think elephant sunscreen!)