Endotracheal Intubation Purpose:build a liable airway for supplying air to patients' Lung. Contraindication: step1: call patient's name and then check conscious, airway, breathing. step2(Give some air): 口咽撐開器+mask+ambu bag LMA Central Venous Catheterization Purpose:build a liable tube to monitor vital signs and give some medicine or the entrance of operation. Contraindication:Infection, thrombosis step1: wear aseptic dress, operative glove. step2: disinfect and set aseptic package. step3: find the trangle circled by the Sternoclavicle muscle.vein is outside, and artery is inside.(at Femor, vein is inside) Put the needle at the lateral side of the middle form the line of ear and sternum. step4: