"Seals" Natural Recordings by Native Speakers
Seals are large, carnivorous marine mammals that belong to the suborder Pinnipedia, which also includes sea lions and walruses. They have a streamlined body, flippers, and a thick layer of blubber to stay warm in cold water.
There are two distinct types of seals: earless seals (also known as true seals) and eared seals, which include the sea lions and fur seals.
Seals are found in the oceans of the world, from the Arctic to the temperate and sub-Antarctic waters, and are known for their ability to swim and dive with ease.
The word "seal" can also refer to a device used to make a mark or signature on a document, such as an electronic seal or a wax seal.
A noun, a verb, or an adjective. <br><br>As a noun: <br>1. A seal is a marine mammal that breathes air and gives birth to live young. There are many species of seal, including the ringed seal, the elephant seal, and the harbor seal.<br>2. A seal can also refer to a stamp or an impression made on a document or a surface to authenticate it, or to indicate that something is authorized or official.<br><br>As a verb: <br>To seal something means to close or fasten it tightly, so that it cannot be opened or entered.<br><br>As an adjective: <br>Something that is sealed is enclosed or shut tightly, so that it is secure or confidential.
Sealants are substances applied to the surfaces of materials to prevent the passage of air, water, or other substances. They are used to:<br><br> Seal gaps and joints in buildings to prevent moisture from entering and causing damage<br> Protect metal and other surfaces from corrosion and wear<br> Insulate pipes and other equipment to reduce heat transfer and energy loss<br> Create a waterproof or airtight barrier in applications such as roofing, flooring, and window frames<br><br>Common types of sealants include:<br><br> Silicone sealants for use on skin and joints<br> Polyurethane sealants for use on wood and concrete<br> Epoxy sealants for use on metal and other industrial applications<br> Caulk, also known as mastic, for use in gaps and joints.
Sailing personnel; workers on a merchant or naval ship, typically responsible for its operation and maintenance.