课堂上,老师问:“鸟是靠什么飞翔的?”“翅膀!”学生异口同声地说。“鸟光靠翅膀就能够飞吗?”老师问。学生想:“鸟不靠翅膀飞,难道还需要别的来飞吗?”老师说:“如果空中没有空气,鸟光有翅膀能飞吗?正因为空中有了空气,鸟扇动的翅膀,才能在空气中产生气流,从而承载起鸟的身 In class, the teacher asks: ”What flight is the flight of the bird?“ ”Wings!“ The students speak in unison. ”Can birds fly by their wings?“ Asked the teacher. Students think: ”The birds do not rely on their wings to fly, do you still need to fly?“ ”Teacher said: " If there is no air in the air, the bird can fly wings with light? Because of the air in the air, Wings, in order to produce air flow in the air, so as to carry the bird’s body