1.   Sunlight penetrates the layers of skin, damaging the collagen and elastic fibres.

2.   Sunlight barely penetrated the dirty windows.

3.   As it rises, the methane is consumed by billions of microbes that exist in a dark netherworld where sunlight never penetrates.

4.   He wanted a table in the back corner, where no sunlight penetrated.

5.   In their absence, sunlight penetrated to more of the forest floor.

6.   In the Chesapeake and other coastal waterways, the filtering clarifies water by purging suspended particles that cause turbidity, allowing sunlight to penetrate to greater depths.

7.   Sunlight better penetrates an open rose.

8.   The first step is that sunlight penetrates the upper layers of skin, Dr. Gilchrest said.

9.   This time, ice was generally so thin that sunlight could penetrate and support concentrations of plankton growing under the ice.

10.   Police said Williams was sunburned, even though very little sunlight penetrates the thick foliage of the forest.