人教版高中英语必修五 Unit5 First aid Warming up (2)(7)

a snake bite

1. Lay the person down and keep him still. 2. Do not wash the venom (毒液) off the skin. 3. Apply pressure to the bitten part with your hands. 毒蛇的牙痕为单排, 无毒蛇的牙痕为双排。