在探究“影响浮力大小的因素”这一问题时，小强同学和同学们合作做了如图所示的一系列实验．

    Many years ago, I was a shy boy and lived a very peaceful life. I liked school but I felt bored.

    And then I started the fourth grade. My teacher, Mrs. Chen, was a young woman who was good at writing, art and music. Her class was very interesting. With her help, I started Fun Club with some boys in my class. I also wrote a book called Through the Forest. And lots of my classmates liked it.

    However, I was surprised when fifty years later I got a letter about a reunion (聚会). A few days later, we had a reunion at Mrs. Chen's home. Reconnecting with Mrs. Chen was a journey back in time. Fifty years have passed, but my teacher still remembers every student. She even doesn't forget the class bully (欺负) — a boy used to hit me with snowballs on my way to school. Lots of teachers thought bullying was nothing serious at that time, but Mrs. Chen didn't agree. She put a stop to it at once when she found out about it.

    Now, in my mid-fifties, I appreciate the gifts Mrs. Chen has given me even more. It's never too late to say thanks to this fantastic teacher. I hope you are lucky enough to have one teacher like Mrs. Chen.