市场上，一位顾客和一位卖微波炉的售货员出现了不同的意见，售货员说，微波炉很省电用它加热食品费不了多少电；顾客说，微波炉很费电，他家的微波炉一开就烧保险丝．他们二人说的情况是否真有矛盾，请你用科学术语表达他们的意思．

    One day, Allan and his friend Henry went swimming in a river. It was very hot. How happy they were in the river! After they got out of the water, they played games in the sun for a while.
    On their way back, Henry saw some flowers. He liked flowers very much and ran into the green field to look at them. Now Allan was walking by himself.
    Then he heard Henry calling out, "A snake（蛇）! Help!..."
    "What's wrong with you?" asked Allan.
    "A snake bit（咬）me in the leg. Come here!"
    Allan ran over and saw a small red wound（伤口）on Henry' s leg.
    "The snake was in the grass. I didn't see it."
    "Sit down quickly"! Allan told Henry.
    Allan put his mouth at the little red wound and began to suck（吸）at it. In this way he saved （挽救）Henry's life. "Oh, Allan, it's very kind of you to help me."
    "That's all right. We are friends and we must always help each other."