Deep trench isolation technology prevents photons of light from leaking between pixels on the sensor, adding greater clarity to images. (flipkart.com)
I had to run through knee - deep trenches of snow to get to the train before it took off. (littlemissfearless.com)
Rather than have underground drainage, many streets have deep trenches running between the street and the sidewalk (shown in the photo on the right). (accessiblecaribbeanvacations.com)