SORU: boş bırakılan yere parçanın anlam bütünlüğünü sağlamak için getirilebilecek cümleyi bulunuz
---- There are those that affect the body surfaces they contact, and those that damage the general nervous system. Surface agents include phosgene gas, chlorine gas, hydrogen cyanide, and mustard gas. While the principal action of the first three occurs through inhalation, mustard is a blistering agent that damages any surface it contacts, including the skin. Nerve agents, on the other hand, which include the chemicals sarin, soman, and tabun, act by blocking the transmission of nerve messages throughout the body. A single drop of nerve agent can shut down the body's nervous system.