. "steradiaal"@nl . "\u7403\u9762\u5EA6"@zh . . "The steradian is a unit of solid angle defined as the solid angle subtended at the center of a sphere by a portion of the surface of the sphere that has an area equal to the square of the radius of the sphere."@en . . "The steradian is a unit of solid angle defined as the solid angle subtended at the center of a sphere by a portion of the surface of the sphere that has an area equal to the square of the radius of the sphere. The steradian is a derived unit in the International System of Units." . . "steradian"@en . "sr" .