此次上师大附二外剑桥部的科学课堂有些不同，老师随手制作一枚枚“空气大炮”和我们小朋友打招呼。让我们体验到无色无味的空气运动。当烟雾粒子随着空气快速通过圆孔时，会形成从孔洞边缘向外再转向内旋转的涡流。由此变成了我们的“空气大炮”。

　　The teacher today is a little different from those of years ago. Effortlessly he makes an “air cannon” to greet the children. We experience the movement of colorless and tasteless air. As the smoke particles pass rapidly through the hole, a vortex is formed that rotates with great speed and becomes an “air cannon”.

科学课堂

　　紧接着，老师用超大吹风机把他自己吹成了“哈哈镜”里的人，让我们笑的前仰后翻，有的小朋友上去尝试“吹肚皮”，只见他的肚皮像猪八戒一样，又大又圆。老师说：“这是伯努利原理，日常生活中，大家不能跨过地铁黄色警示线，也是这一原理起作用。

　　Immediately after this, the teacher uses an oversized air-blower to transform himself into an oversized person, completely distorting his appearance and causing the younger students to laugh with delight. Some children get up and attempt to “blow up their bellies”, large and round, like ZhuBajie – a cartoon character. “This is an example of the Bernoulli effect – the relationship between pressure and speed- and it’s the reason why we should stand safely behind the yellow line in the subway station”, warns the teacher.

　　最奇妙的是，老师用一点点热水制造了整个空间的“腾云驾雾”效果，还以为“孙大圣”要降临呢。老师解释说，这是二氧化碳，吸收大量热，使温度降低，低温使水蒸气形成小液滴，造成的云雾效果。

　　The most amazing thing is when the teacher uses a few drops of hot water to create a magical cloud effect, as if the Monkey King is coming. He explains that it is frozen CO2, or dry ice. As the CO2 absorbs the heat, the temperature drops. Instead of melting, a gas is formed, creating the resulting smoke and mist.

　　以上是我校学生学习感受。These are our students’ learning experiences.

　　小学生通过直观的感受，了解到当速度很快时，有一股神奇的力牵引物体运动。这其实是伯努利原理：在水流或气流里，如果速度小，压强就大;如果速度大，压强就小。

　　The primary school student learns through visual experience and here they learn that when something moves at a great speed, there is a magical traction force. This is actually the Bernoulli Principle: it infers that there is a decrease in pressure as the velocity of water or air increases, and if velocity decreases, pressure increases.

同学们踊跃参与

　　原理依旧是那个原理，当初的教法都是让大家死记硬背，再做题、套公式分析，至于对科学实验的热爱，全被无尽的题海消磨殆尽。今天的课堂先展示现象，诱导学生观察，引导学生提出假设，然后做实验让学生自己总结，最后加以归纳和推导引出原理。这样的上课方式培养了学生敏锐的观察力，呵护了学生的好奇心，激发了学生对科学探索的热爱，所以小小年纪就掌握了原本高中阶段的才能掌握的知识点也不足为奇啦!这样的上课方式，已被我校越来越多的老师运用，相信这一批“站在巨人肩膀上”的学生们有更多实力站得更高、看得更远!

　　—— 后记

　　These principles have remained unchanged. Where previously learning took place through rote memorization, and formula analysis through rigorous testing, the love of scientific experiments could be depleted by an endless sea of questions. Today’s class gives students a first-hand look at several phenomena, encourages students to carefully observe and guides them to formulate hypotheses. After conducting experiments, students are prompted to summarize the outcomes and finally come to their own conclusions based on scientific principles. This type of class has cultivated the students’ keen observation, aroused their curiosity and inspired their love of scientific exploration. Therefore, it isn’t surprising that high school knowledge can be mastered at a young age! More and more teachers are making use of these teaching methods at our school. I believe that these students who have the opportunity to stand on the shoulders of giants, have more strength to stand taller and look further!

　　---Postscript