Ok, venomous snakes are the ones that secrete poisonous substances or venom, like the snakes of the viper family or cobras.
毒蛇是一种分泌有毒物质或毒液的动物，像蝰蛇科的蛇或眼镜蛇。
2
She told her listeners that, if someone released several cobras inside the auditorium, they'd all be constantly looking around for snakes as she spoke.
她告诉听众们说，如果有人在礼堂里面放上几条眼镜蛇，那么他们就会在她讲话时不停地四处寻找蛇。
3
In most venomous snakes, like vipers and cobras, the venom is used to catch and inmoblize the prey; but in colubrids, venom drips onto the prey only after the prey is in the snake's mouth.